100 mm extract
You are finishing a bathroom or kitchen fan on a 100 mm duct and you can supply screws. The Kair louvre is the only listing here that states a 100 mm male spigot, at about £11.49, with 4.5 from 3,590 ratings. The louvres are fixed.
Ventilation grilles in 2026
The best ventilation grilles, compared.
Top pick: Leliafleury 2 × 60 × 150 mm aluminium cabinet vents Best value: Map 9 × 3 in brown louvre with flyscreen – About £3.99, with openings up to 229 × 76 mm, a printed 4,400 mm² open area, and 4.5 from 803 ratings. Updated October 2026.
A ventilation grille here is a cover for an air opening, not a cooking grate. You might finish a bathroom or kitchen extract outside, replace a broken cover, or vent a cupboard, shed or plinth. Judge it by the duct or hole, whether you can reach the flyscreen, and whether the screws are in the box. These twelve amazon.co.uk listings sit under and barbecues. A fixed louvre is not a gravity shutter. In England, Approved Document F says an external terminal should have a free area of at least 90 per cent of its duct. A 100 mm duct is about 7,854 mm², so 90 per cent is about 7,068 mm². The [ventilation grille buying guide](/hub/grills-and-barbecues/ventilation-grille/sub/ventilation-grille-buying-guide) sets out type, size, mesh and screws without naming a winner. It might be a louvred wall outlet, a flat plate, an air-brick-sized vent, or a small cabinet grille.
A ventilation grille here is a cover for an air opening, not a cooking grate. You might finish a bathroom or kitchen extract outside, replace a broken cover, or vent a cupboard, shed or plinth.
40 products checked · 58 hrs invested · +17,200 readers
12 of 12: Best ventilation grilles compared
Swipe for more
1-2 of 12Best overall
Best value
7.1/10
7.6/10
8.1/10
8.0/10
8.2/10
7.7/10
8.4/10
7.7/10
8.0/10
8.1/10
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4.2/10
∼ £9
∼ £10
∼ £9
∼ £5
∼ £16
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∼ £11
∼ £13
∼ £16
∼ £4
∼ £12
∼ £8
5.0(5)
4.8(20)
4.6(3,748)
4.6(3,748)
4.6(1,355)
4.6(177)
4.5(3,590)
4.5(1,749)
4.5(1,582)
4.5(803)
4.4(58)
–
Personal buying guide
Which ventilation grille fits the opening?
Question 1 of 2
What opening are you covering?
The best ventilation grilles in detail
Our view
You get two aluminium covers, each 60 × 150 mm, for £9.49, and the pack weighs about 50 g. The bullets describe cupboard, drawer, and cabinet slots with oval holes, which is a different job from a 100 mm duct, and they do not name a separate flyscreen. Fitting is mark, drill, and screw, and screws are not listed in the box. The listing says 5.0 from 5 ratings. The extract has two UK reviews: one reviewer fitted a kitchen plinth, liked the finish, and found it easy, and the other had not fitted the covers yet. The bullets also name other sizes in the range, while this ASIN is the 60 × 150 mm pair. Waterproof and moisture-proof appears as listing wording, with no IP rating behind it. Five ratings cannot carry a wall-vent decision.
Pros
- Two aluminium covers, each 60 × 150 mm, at £9.49
- One UK review fitted a kitchen plinth and liked the finish
- Oval slots aimed at a cupboard, drawer, or plinth
- Light pack, about 50 g
Cons
- Only five ratings, and one of the two extracted reviews was not fitted yet
- Screws are not listed
- No flyscreen is stated
- No IP rating behind the moisture-proof wording
Best for: A cupboard, drawer, or kitchen plinth that needs two 60 × 150 mm slotted covers.
Less suitable: An outside wall duct, an air brick, or a 100 mm fan.
Specifications
- Model
- Leliafleury 2 × 60 × 150 mm aluminium cabinet vents
- Brand
- Leliafleury
- Price
- ∼£9
- Customer rating
- 5.0/5(5)
- Fits
- 60 × 150 mm each
- Rear spigot
- No
- Material
- Aluminium alloy
- Face size
- 60 × 150 mm
- Weight
- 50 g
Common questions
What is in the pack?
Two aluminium covers in 60 × 150 mm. The bullets name other sizes, but this ASIN is the 60 × 150 mm pair.
Is it a 100 mm extractor grille?
No. The bullets describe cupboard, drawer, and cabinet covers. One UK review used a kitchen plinth.
How many reviews are there?
The listing line says 5.0 from 5. The extract contains two UK reviews. One reviewer had not fitted it yet.
Our view
This anthracite steel cover is 260 × 105 mm and 150 g, with a polymer or powder-coat finish and a protection screen, at £9.95. The listing is 4.8 from 20 ratings, and the file holds eight reviews. The UK lines describe a summerhouse or shed, a plate heavier than shop vents the reviewer had seen, and a hob exhaust on a kitchen-island plinth. Those UK reviews do not state a repeated fault. Screws are not included, and the cover is surface-mounted. The listing says ceiling and sidewall, internal or external, with no IP rating and no free area. Twenty ratings is a short sample beside plates that have passed a thousand reviews, so the 4.8 carries less weight than the star alone suggests.
Pros
- Anthracite coated steel, 260 × 105 mm, with a protection screen
- UK reviews mention a shed and a kitchen-island plinth
- No repeated fault in the UK lines in this file
- Listing allows ceiling and sidewall, inside or outside
Cons
- Only 20 ratings, with eight reviews in the file
- Screws are not included
- Free area is not printed
- No IP rating
Best for: A 260 × 105 mm hole on a shed, summerhouse, or plinth where you want anthracite steel and can supply screws.
Less suitable: A 100 mm duct, or a choice that needs a large review base.
Specifications
- Model
- Repa Market 260 × 105 mm anthracite cover
- Brand
- Repa Market
- Price
- ∼£10
- Customer rating
- 4.8/5(20)
- Fits
- 260 × 105 mm face
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- No
- Material
- Coated steel
- Colour
- Anthracite
- Face size
- 260 × 105 mm
- Weight
- 150 g
Common questions
Are screws included?
No. The bullets say no screws are included, and the cover is surface-mounted.
Where have UK reviewers used it?
In this extract: a summerhouse or shed, and a hob exhaust on a kitchen-island plinth. The listing count is 20 and the file has eight reviews.
Can it go on a ceiling?
The listing says ceiling and sidewall, internal or external. It does not state an IP rating.
Our view
The white Awenta TRU10 is a plastic cover about 300 × 300 mm, listed at 30.2 × 30.2 × 0.71 cm and 215 g, with a 250 × 250 mm grille opening and an insect screen, at £9.40. Four screw-cover caps are in the box and the screws are not. The extract shows 4.6 from 3,748 ratings, and that review text, star line, and rank match the 150 mm Awenta file, so you cannot read them as a test of this size alone. In that shared block, reviewers mention an easy fit, sturdier plastic than an old yellowing metal vent, and some flex in the plate. A trade page for code TRU10 says polystyrene, while the Amazon extract says plastic. There is no spigot and no IP rating.
Pros
- 300 × 300 mm face with a stated 250 × 250 mm grille opening
- Four screw-cover caps in the box
- Insect screen
- £9.40, below the other 300 mm plates in this set
Cons
- Screws are not included
- Review block, star line, and rank are shared with the 150 mm Awenta
- Some buyers in the shared block call the plate slightly flimsy
- Amazon says plastic; a trade page for TRU10 says polystyrene
Best for: A flat opening near 250 × 250 mm where you want caps over the screws and will buy the screws yourself.
Less suitable: A duct that needs a spigot, or a decision that depends on reviews unique to this 300 mm plate.
Specifications
- Model
- Awenta 300 × 300 mm white plastic cover
- Brand
- Awenta
- Price
- ∼£9
- Customer rating
- 4.6/5(3,748)
- Fits
- 250 × 250 mm opening
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- Caps only
- Material
- Plastic
- Colour
- White
- Face size
- 300 × 300 mm
- Weight
- 215 g
Common questions
Are screws included?
No. The listing includes four screw-cover caps and says screws are not included.
Is this a duct spigot?
No. It is a flat 300 × 300 mm cover with a 250 × 250 mm grille opening.
Are the 3,748 reviews only for this size?
The extract’s review text, star line, and rank line match the 150 mm Awenta file. Treat them as one shared scrape.
Our view
This white cover is 150 × 150 mm outside, with a 115 × 115 mm grille and an insect screen, at £4.68 and about 50 g. Four screw-cover caps come with it and the screws do not. The extract’s 4.6 from 3,748 ratings is the same block as the 300 mm Awenta, including the rank line, so it is not a separate test of this smaller plate. The shared comments praise an easy fit and the screw covers, and they also mention flex and missing screws. A dark-brown remark inside that shared text does not match this white title. The extract gives the origin as Poland. It is a flat plate, with no 100 mm spigot on the listing.
Pros
- 150 × 150 mm face and a stated 115 × 115 mm opening
- £4.68, with four screw-cover caps
- Insect screen
- Light, at about 50 g
Cons
- Screws are not included
- Star line and review text are shared with the 300 mm Awenta
- Shared comments mention some flex
- No rear spigot
Best for: A small square hole around 115 × 115 mm, if you already have screws and caps will finish the look.
Less suitable: A 100 mm round duct, or anyone reading the 3,748 reviews as proof of this size alone.
Specifications
- Model
- Awenta 150 × 150 mm white plastic cover
- Brand
- Awenta
- Price
- ∼£5
- Customer rating
- 4.6/5(3,748)
- Fits
- 115 × 115 mm opening
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- Caps only
- Material
- Plastic
- Colour
- White
- Face size
- 150 × 150 mm
- Weight
- 50 g
Common questions
Are screws included?
No. The bullets include four screw-cover caps and say screws are not included.
What opening does it cover?
The bullets say the outside is 150 × 150 mm and the grille is 115 × 115 mm.
Why is the review count the same as the 300 mm Awenta?
The saved review text, the 4.6 from 3,748 line, and the rank line match B00UNOXX7K. They are one shared scrape.
Our view
Across 1,355 amazon.co.uk ratings at 4.6, this black sheet-steel plate is 300 × 150 mm and 190 g, at £15.85. Reviewers often fit it as a neater replacement for a rusty cover, and the insect mesh is present. The included-components line names screws, though some buyers still had none to hand. One reviewer said the border, frame, and louvres cut the opening enough to fail their free-air check, so the 300 × 150 mm face is not the open area. The plate is described as a little thin and bendy, and one review said the mesh, called plastic, was stuck only at the top and bottom. In another review the black looked lighter than the photo. The bullets say internal and external use, and they do not state an IP rating.
Pros
- 4.6 from 1,355 amazon.co.uk ratings
- 300 × 150 mm sheet steel with insect mesh
- Included-components line names screws
- Reviewers use it to replace a rusty cover
Cons
- One reviewer failed a free-air check because the frame and louvres cut the opening
- Described as a little thin and bendy
- Mesh called plastic and, in one review, unfixed along the sides
- Some buyers still had no screws to hand
Best for: A 300 × 150 mm hole on a wall or ceiling where the screw points line up and you will check the open area yourself.
Less suitable: A 100 mm duct that needs a spigot, or a job that needs a printed free area.
Specifications
- Model
- LIRAST 300 × 150 mm black metal grille
- Brand
- LIRAST
- Price
- ∼£16
- Customer rating
- 4.6/5(1,355)
- Fits
- 300 × 150 mm face
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- Yes
- Material
- Sheet steel
- Colour
- Black
- Face size
- 300 × 150 mm
- Weight
- 190 g
Common questions
Are screws included?
The included-components line says the vent cover comes with screws. Some reviews still say the buyer had to find screws.
Is the open area the same as 300 × 150 mm?
The listing does not print a free area. One reviewer said the border, frame, and louvres cut the opening enough to fail their free-air check.
Can it go outside?
The bullets say internal and external use. They do not state an IP rating. One review said the black was lighter than the photo.
Our view
This 260 × 190 mm cover is £13.98, weighs 109 g, and carries 177 amazon.co.uk ratings at 4.6. Reviewers mention the finish and stiffness over broken air-brick fronts, on a shed, and over an old letterbox, and they note the insect mesh as useful. One short review says it stops the rain. That is one comment, and the listing prints no IP rating. The title says aluminium and the material field says galvanised steel, so you should keep both lines in view rather than pick one. The inch sizes on the listing also disagree with each other. Screws are not stated. Repeated breakage is scarce in the first 50 reviews. The bullets include walls, ceilings, cabinets, furniture, and doors, and there is no rear spigot.
Pros
- 4.6 from 177 amazon.co.uk ratings
- 260 × 190 mm face with an integrated mesh, at 109 g
- Used over air bricks, on a shed, and over a letterbox
- Little repeated breakage in the first 50 reviews
Cons
- Title says aluminium and the material field says galvanised steel
- Inch sizes on the listing disagree
- Screws are not stated
- No IP rating; one rain comment is a review, not a weather test
Best for: A rectangular hole around 260 × 190 mm where you can live with the material clash and bring your own fixings.
Less suitable: A 100 mm duct, or anyone who needs the metal named in one consistent field.
Specifications
- Model
- Vent Systems 260 × 190 mm metal cover
- Brand
- Vent Systems
- Price
- ∼£14
- Customer rating
- 4.6/5(177)
- Fits
- 260 × 190 mm face
- Rear spigot
- No
- Insect screen
- Yes
- Material
- Galvanised steel
- Colour
- Aluminium
- Face size
- 260 × 190 mm
- Weight
- 109 g
Common questions
Is it aluminium or steel?
The title says aluminium. The material field says galvanised steel. Both lines are in the extract.
Does it have a mesh?
Yes. The listing says an integrated fine screen.
Can it go on a ceiling?
The bullets include walls, ceilings, cabinets, furniture, and doors. They do not state an IP rating.
Our view
Across 3,590 amazon.co.uk ratings at 4.5, the black Kair grille is a 155 × 155 mm plastic face with a 100 mm male spigot, at £11.49. Reviewers push it onto a standard 100 mm hole, on outside walls and on soffit boards, and the listing names Kair duct DUCVKC250 or a 102 mm hose. The flyscreen is welcomed, then often called too soft, and one buyer fitted a stainless screen instead. Screws are not in the box. The face is hard to prise off, especially on a soffit, and the listing’s method is a flat screwdriver. The louvres are fixed, so they do not act as shutters, and you can cut the spigot off if you want a flat back. A few buyers thought the spigot was the wrong size and nearly returned it. For a 100 mm duct you can reach, it is the top pick in this set.
Pros
- Only listing here that states a 100 mm male rear spigot
- 4.5 from 3,590 ratings, and rank 1 in Registers, Grilles & Vents in the extract
- Push-fit to the named Kair duct or a 102 mm hose
- Flyscreen, with a screwdriver method to open the face
Cons
- Screws are not supplied
- Face is hard to remove, especially on a soffit
- Flyscreen called too soft
- Fixed louvres, so it will not close against a back-draught
Best for: The outside end of a 100 mm bathroom or kitchen extract, if you will supply screws and can reach the mesh.
Less suitable: A flat hole with no duct, a soffit you cannot reach to clean, or a job that needs gravity shutters.
Specifications
- Model
- Kair black 100 mm louvre with spigot
- Brand
- Kair
- Price
- ∼£11
- Customer rating
- 4.5/5(3,590)
- Fits
- 100 mm duct
- Rear spigot
- Yes, 100 mm
- Insect screen
- Yes
- Screws
- No
- Material
- Plastic
- Colour
- Black
- Face size
- 155 × 155 mm
- Weight
- 90 g
Common questions
Does it have a spigot?
Yes. The listing says a 100 mm male rear spigot, and that you can cut the spigot off if you want a flat back.
Are screws included?
The bullets do not list screws. Reviews say you need your own.
Can you clean the flyscreen?
The listing says you flick the louvre open with a flat screwdriver. Reviews say that is awkward, especially on a soffit, and that the screen is soft.
Our view
On 15 October 2026 the shop page for this URL was a 300 × 300 mm white plastic soffit cover for openings up to 252 × 252 mm, at £12.98, with a nylon screen and screws not included. The extract’s rating is 4.5 from 1,749. Reviewers use it over a kitchen extractor outlet, a garage door, and a caravan roof, and they like the look when screw-hole covers are present. One review says those covers were missing. The plate is called thin and a little flimsy, and reviewers still fit it. The saved listing’s ASIN line prints B0C1Y36S1J while the shop URL is B0BZPM3DZB, and the raw bullets omit the size, so measure against the live page before you drill. There is no rear spigot.
Pros
- 300 × 300 mm face for openings up to 252 × 252 mm on the URL page
- 4.5 from 1,749 ratings in the extract
- Nylon insect screen
- Used over a kitchen extract, a garage door, and a caravan roof
Cons
- Screws are not included, and screw covers are inconsistent in the reviews
- Called thin and a little flimsy
- Raw ASIN line prints B0C1Y36S1J, not the shop URL
- No rear spigot
Best for: A square soffit or wall hole up to 252 × 252 mm, if you buy screws and check the live size on the day.
Less suitable: A round 100 mm duct, or a buyer who needs the saved listing and the shop page to name the same ASIN.
Specifications
- Model
- Vent Systems 300 × 300 mm flat cover
- Brand
- Vent Systems
- Price
- ∼£13
- Customer rating
- 4.5/5(1,749)
- Fits
- Up to 252 × 252 mm
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- No
- Material
- Plastic
- Colour
- White
- Face size
- 300 × 300 mm
Common questions
Which ASIN is this?
The shop URL is B0BZPM3DZB. The saved listing’s ASIN line prints B0C1Y36S1J, and the raw bullets omit the size.
What size is the plate?
On 15 October 2026 the URL page said 300 × 300 mm outside, for openings up to 252 × 252 mm, with a nylon screen.
Are screws included?
That page says screws are not included. Reviews in the extract say the same. One review wanted screw covers and another said they were missing.
Our view
Across 1,582 amazon.co.uk ratings at 4.5, this white coated-steel cover is about 300 × 200 mm and 290 g, at £15.95. Reviewers like the finish, the insect screen, and a plate that feels sturdy once it is up. The repeated mark-down is the empty screw bag: several reviews stop at four stars only because the fixings are missing, and the bullets already say screws are not included. The listing says ceiling and sidewall, internal or external, and it does not state an IP rating or a free area. The sampled reviews do not repeat rust or breakage. The DIY rank line, 3,437, matches the anthracite 300 × 100 mm Repa extract, so that rank is not unique to this size.
Pros
- Coated steel, about 300 × 200 mm and 290 g
- 4.5 from 1,582 amazon.co.uk ratings
- Insect screen; reviewers mention the finish and strength
- Listing states ceiling and sidewall, inside or outside
Cons
- Screws are not included, and reviews mark the listing down for that
- Free area is not printed
- No IP rating
- The sales-rank line is shared with another Repa size
Best for: A 300 × 200 mm ceiling or wall hole where you want coated steel and will bring your own screws.
Less suitable: A round duct, or a buyer who expects fixings in the box.
Specifications
- Model
- Repa Market 300 × 200 mm white steel cover
- Brand
- Repa Market
- Price
- ∼£16
- Customer rating
- 4.5/5(1,582)
- Fits
- 300 × 200 mm face
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- No
- Material
- Coated steel
- Colour
- White
- Face size
- 300 × 200 mm
- Weight
- 290 g
Common questions
Are screws included?
No. The bullets say no screws are included. Reviews repeat that and often mark the listing down for it.
Can it go on a ceiling?
The listing says ceiling and sidewall, and internal or external mounting. It does not state an IP rating.
What is it made of?
The material field says metal, with a polymer coating. The bullets also say a powder-coat finish and an insect screen.
Our view
The dark brown Map louvre is 260 × 90 mm, for openings up to 229 × 76 mm, and it prints an open area of 4,400 mm², at £3.99 and 40 g. Across 803 amazon.co.uk ratings at 4.5, reviewers use it on a broken vent, a shed, and as a lighter cover over decorative air bricks, and they mention the fixed flyscreen against insects. One shed review drilled the holes and reported airflow at both ends. One order arrived with brown and white mixed, and the replacement was wrong again. A few comments call the plastic thin. That 4,400 mm² figure sits below about 7,068 mm², which is 90 per cent of a 100 mm duct’s area, so this is an air-brick cover rather than a bathroom-fan terminal. Screws are not stated. At this price it is the best value when the hole really is a 9 × 3 in slot.
Pros
- £3.99, with 4.5 from 803 amazon.co.uk ratings
- States openings up to 229 × 76 mm and 4,400 mm² open
- Fixed flyscreen
- Used on sheds and over air bricks
Cons
- Printed open area is below a 90 per cent line for a 100 mm duct
- One order arrived in the wrong colours, and the replacement did too
- A few comments call the plastic thin
- Screws are not stated
Best for: A single-brick or 9 × 3 in opening, a cupboard, or a shed, where 4,400 mm² is enough air.
Less suitable: The outside end of a 100 mm extractor duct.
Specifications
- Model
- Map 9 × 3 in brown louvre with flyscreen
- Brand
- Map
- Price
- ∼£4
- Customer rating
- 4.5/5(803)
- Fits
- Up to 229 × 76 mm
- Rear spigot
- No
- Insect screen
- Yes
- Material
- Plastic
- Colour
- Dark brown
- Face size
- 260 × 90 mm
- Weight
- 40 g
Common questions
What hole does it cover?
The listing says openings up to 229 × 76 mm (9 × 3 in). Overall size is 260 × 90 mm. Screw-hole spacing is 245 × 76 mm.
Is 4,400 mm² enough for a 100 mm duct?
The listing prints 4,400 mm² when open. A 100 mm duct is about 7,854 mm², and 90 per cent of that is about 7,068 mm². Those two figures do not match.
Does it have a flyscreen?
Yes. The bullets say a fixed flyscreen. Reviews mention it against insects. One order arrived in the wrong colours.
Our view
This anthracite plate is 300 × 100 mm and 150 g, coated steel with a protection screen, at £11.95. The listing is 4.4 from 58 ratings. Only two reviews in the file are clearly from the United Kingdom: one calls the price fair and says it does the job, and one calls it a low-profile metal cover in the colour they wanted. The other reviews are from the United States, Spain, Italy, or Germany, and they are not used here as UK opinion. Screws are not included. The DIY rank, 3,437, is the same line as the white 300 × 200 mm Repa extract. The listing says ceiling and sidewall, internal or external, and it prints no IP rating and no free area.
Pros
- 300 × 100 mm anthracite coated steel with a protection screen
- Two UK reviews call the price fair and the profile low
- Surface-mounted, for ceiling or sidewall on the listing
- £11.95
Cons
- Only two UK reviews in a file of eleven
- Screws are not included
- Sales-rank line matches another Repa size
- No free area and no IP rating
Best for: A long, low 300 × 100 mm opening where the anthracite finish matters more than a large UK review sample.
Less suitable: A round extractor duct, or a buyer who wants dozens of UK reviews on this size.
Specifications
- Model
- Repa Market 300 × 100 mm anthracite cover
- Brand
- Repa Market
- Price
- ∼£12
- Customer rating
- 4.4/5(58)
- Fits
- 300 × 100 mm face
- Rear spigot
- No
- Insect screen
- Yes
- Screws
- No
- Material
- Coated steel
- Colour
- Anthracite
- Face size
- 300 × 100 mm
- Weight
- 150 g
Common questions
Are screws included?
No. The bullets say screws are not included. A non-UK review in the file also wanted colour-matched screws.
What do UK reviews say?
Two UK reviews in the file call it a fair price and a low-profile metal cover in the right colour. Most other reviews in the file are not from the UK.
Is the sales rank unique to this size?
The extract prints the same DIY rank, 3,437, and the same subcategory rank, 10, as the white 300 × 200 mm Repa listing.
Our view
The Meralo cover is a white PP louvre, 14 × 14 × 5 cm and 130 g, listed at £7.99, and the listing says it fits standard 100 mm ducting on a wall or ceiling. It does not use the word spigot, so the extract does not show whether a rear stub is moulded on. A fine mesh flyscreen is built in, and the bullets claim angled louvres against rain and draughts, with no IP rating printed. The included-components field is only a slash, so screws are not confirmed. This extract has no review block, and the listing first appeared on 16 June 2026, so there is no buyer pattern on fit, colour, or the mesh. Treat the 100 mm line as something you check on the back of the plate.
Pros
- White PP louvre, 14 × 14 × 5 cm, 130 g, at £7.99
- Listing claims a fit for standard 100 mm ducting
- Fine mesh flyscreen is built in
- Bullets name walls and ceilings
Cons
- The word spigot is not used
- No review block in the extract
- Components field is only a slash, so screws are unconfirmed
- No IP rating printed
Best for: A wall or ceiling cover where you can look at the back and confirm a stub before you use it on a duct.
Less suitable: Anyone who needs buyer evidence, or a listing that states a male spigot for a 100 mm fan.
Specifications
- Model
- Meralo 100 mm white louvre with flyscreen
- Brand
- Meralo
- Price
- ∼£8
- Fits
- 100 mm claimed
- Insect screen
- Yes
- Material
- PP plastic
- Colour
- White
- Face size
- 140 × 140 mm
- Weight
- 130 g
Common questions
Will this fit 100 mm ducting?
The listing says it fits standard 100 mm (4 inch) ducting. It does not use the word spigot, so the extract does not show a rear stub.
Does it have a flyscreen?
Yes. The listing says a fine mesh flyscreen is built in. It does not say how often to replace it.
What do buyers say?
This extract has no review block, so the star rating and review count are not available.
How we compared
Twelve amazon.co.uk listings were compared from the captured shelf price, the printed size and spigot line, and the stored review themes. There is no laboratory test, and no listing is treated as Part F compliant because of its star rating. The top pick is the only cover that states a 100 mm male spigot and has a large review file. Best value is the lowest-priced plate that prints an opening size and an open area for a 9 × 3 in slot, with hundreds of ratings. A missing review line stays unproven. The two Awenta files share one review block, so that count is not used twice.
1
Job and fit
30%A 100 mm fan outlet needs a stated spigot of that diameter. A flat plate covers a hole and does not grab a duct. The Map plate and the 60 × 150 mm cabinet pair are other jobs.
2
Free area
20%Approved Document F asks for an external terminal free area of at least 90 per cent of the duct. A 100 mm duct is about 7,854 mm². Most listings print no free area. Map prints 4,400 mm².
3
Mesh and screws
20%A flyscreen only helps if you can reach it. Kair reviews call the face awkward, especially on a soffit. LIRAST names screws. Awenta, Repa and the Vent Systems 300 mm page say they are not included.
4
Material for the wall
15%Plastic is normal for a spigot. Repa and LIRAST are coated or sheet steel. One Vent Systems cover says aluminium in the title and galvanised steel in the material field.
5
Review evidence
15%Amazon.co.uk stars and review count, then whether the stored text matches the job. A large count is not Part F compliance. A shared Awenta block is one scrape. No review line is unproven.
Independent review
Last updated: October 2026
8 sources checked
Ventilation grille buying guide
Use this section to name the opening before you compare stars. The table ranks twelve amazon.co.uk covers. It does not test airflow, and it does not treat any listing as Part F compliant. A 100 mm extract needs a stated spigot. A flat hole needs a face that matches. A cupboard needs the small pair, not a wall terminal.
What is a ventilation grille?
A ventilation grille in this comparison is a cover or terminal for an air opening. It might be a louvred wall outlet, a flat plate, an air-brick-sized vent, or a small cabinet grille. You might use one to end a bathroom or kitchen extract outside, to replace a broken cover, or to vent a cupboard, shed or plinth. These twelve amazon.co.uk listings are not cooking grates. The useful checks are the duct or hole each one fits, whether the flyscreen can be cleaned, and whether screws are in the box.
Best for
- A 100 mm bathroom or kitchen extract where the listing states a male spigot and you can supply screws
- A flat hole, air brick, shed, cupboard or plinth when the face size matches the opening
Not ideal for
- A boiler flue, a chimney, or a loft used as the discharge route
- Anyone who needs a gravity shutter, a printed Part F certificate, or screws that the listing does not include
Mistakes to avoid
- 1
Buying the face and missing the duct
A 300 mm plate can still have no spigot. Awenta and Repa covers sit over a hole. Only the Kair listing states a 100 mm male spigot. Meralo claims a 100 mm fit and does not use the word spigot.
- 2
Expecting screws, or counting Awenta twice
Awenta, Repa and the Vent Systems 300 mm page say screws are not included. The two Awenta files share one review block and the line 4.6 from 3,748. That is one scrape, not two tests.
- 3
Covering a flue or a 100 mm hood with the wrong plate
Do not mesh a boiler flue, and do not discharge into a loft or a chimney. A fixed louvre is not a back-draught shutter. A 100 mm plate is the wrong end for a hood whose instructions say 125 mm or 150 mm.
What to weigh up
Job and free area
HighStart with the opening, because these covers are not one product. A 100 mm fan needs a spigot of that diameter. In this set, only Kair states a 100 mm male spigot, and the listing says it can be cut off if you want a flat back. A flat Awenta or Repa plate covers a hole and does not connect to duct. The Map 9 × 3 in louvre is for openings up to 229 × 76 mm. The aluminium pair is for a 60 × 150 mm cupboard or plinth slot. Free area is the next number, and it is not the face size.
Mesh, screws and material
HighA flyscreen helps only if you can take the face off. Kair reviews say that job is awkward, especially on a soffit, and they often call the screen too soft. LIRAST is the listing that names screws in the components line, though some buyers still had none to hand. Awenta includes four screw-cover caps and says the screws are not included. Repa says the same about screws. The Vent Systems 300 mm page, checked on 15 October 2026, also says screws are not included.
Which option suits you?
Three typical situations, each with a recommendation from this comparison.
Air brick or shed slot
You are covering a single-brick or 9 × 3 in opening, a cupboard slot of that size, or a tired air brick, and 4,400 mm² of open area is enough. The Map louvre is about £3.99, with 4.5 from 803 ratings. It is not a 100 mm fan terminal.
Cupboard or plinth
You need two small slotted covers for a cupboard, drawer or kitchen plinth, not an outside duct. The Leliafleury pair is two aluminium 60 × 150 mm pieces at about £9.49. The listing has 5.0 from 5 ratings, and screws are not listed.
Common questions about ventilation grilles
Which ventilation grille is the top pick here?
The Kair black louvre is the top pick when the job is a 100 mm extract. It is the only listing in this set that states a 100 mm male spigot, at about £11.49, with 4.5 from 3,590 amazon.co.uk ratings. Screws are not in the box, the face is awkward to remove, and the louvres are fixed, so they do not close against a back-draught. A 9 × 3 in slot is a different job.
How much does a ventilation grille cost on amazon.co.uk?
On 15 October 2026, shelf prices in this set ran from about £3.99 to about £15.95. Entry covers, about £3.99 to £7.99, are the Map plate, the Awenta 150 mm cover and the Meralo louvre. Mid prices, about £9.40 to £13.98, include the Awenta 300 mm cover, the cabinet pair, both anthracite Repa plates, the Kair spigot and both Vent Systems covers. LIRAST and the white 300 × 200 mm Repa plate sit at about £15.85 to £15.95.
What should you check before you buy a ventilation grille?
Name the job first. A 100 mm fan outlet needs a spigot of that diameter. A flat Awenta or Repa plate covers a hole and does not grab a duct. Then check free area, not only the face size. In England, Approved Document F says an external terminal should have a free area of at least 90 per cent of its duct. Most listings here print no free area. Check the mesh and the screw line too.
Is a fixed louvre a back-draught shutter?
No. A fixed louvre does not close. The Kair listing’s louvres stay open, so they do not act as gravity shutters. Do not treat any plate here as a non-return valve. If the fan instructions call for a shutter, this comparison does not show one. Cutting the Kair spigot off makes a flat back. It does not add a shutter, and it does not turn a flat Awenta or Repa plate into a duct connection.
Does one of these grilles mean the extract complies with Part F?
No. A large review count is not Part F compliance, and none of these listings is treated here as tested to that document. In England, Approved Document F Volume 1 sets extract rates, including 30 litres a second for a kitchen hood to outside and 15 litres a second for a bathroom. A recirculating hood alone does not comply. Wales, Scotland and Northern Ireland have their own texts. These grilles are not flue terminals.
Should the ventilation grille be plastic or steel?
Plastic is the normal material for a spigot. The Kair terminal is plastic. Repa and LIRAST are coated or sheet steel plates, and they have no rear spigot. The Vent Systems 260 × 190 mm cover says aluminium in the title and galvanised steel in the material field, so those two lines do not agree. Choose the material for the wall you are covering. Steel on the title does not make a flat plate into a 100 mm duct terminal.
Can a ventilation grille cover a boiler flue or a chimney?
No. Do not mesh a boiler flue, and do not discharge an extract into a loft or a chimney. These grilles are not flue terminals. A domestic fan does not generally need planning permission, though listed buildings differ, and Part F and Part P still apply. Call a professional for a new core in a cavity wall, bathroom electrical work, a listed building, a gas or solid-fuel flue, or any opening you cannot see from outside.
Are these the same as a barbecue grill grate?
No. The twelve listings are covers for air openings: a louvred outlet, a flat plate, an air-brick vent, or a cabinet pair. They are not cooking grates, tumble-dryer kits or flue terminals. A fixed louvre here does not sear food and does not replace a grate. If you are choosing a stainless cooking surface for a barbecue, that is a different comparison: stainless steel barbecue grill grate.
Our verdict
Twelve amazon.co.uk covers split into a spigot terminal, flat plates, an air-brick louvre and a cabinet pair. The Kair black louvre is the top pick for a 100 mm extract you can reach: it states a 100 mm male spigot, at about £11.49, with 4.5 from 3,590 ratings. Screws are not supplied, and the louvres do not close. The best value is the Map 9 × 3 in louvre, at about £3.99, with a printed open area of 4,400 mm² and 4.5 from 803 ratings, when the hole really is that slot. That area is below a 90 per cent line for a 100 mm duct.
Best value
View offer
Map 9 × 3 in brown louvre with flyscreen
About £3.99, with openings up to 229 × 76 mm, a printed 4,400 mm² open area, and 4.5 from 803 ratings.
Editorial
Editor
Grills and barbecuesventilation grilleDIY & tools
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Updated: October 2026
8 sources checked
Guides to ventilation grilles
Guides on what to look for, how to use a product, and common mistakes.
Best ventilation grille for the jobWho each kept listing is for, and who should skip it, without restating the regulations in full.Ventilation grille buying guideType, size, mesh and screws before a model, with no price table and no winner.How to fit a ventilation grilleFit a cover on an existing opening, and the point where a professional should take over.Extractor outlet or flat plateA 100 mm fan or hood outlet compared with a flat plate. Not cupboards or air bricks.Plastic or metal ventilation grilleWhen plastic is enough, and when coated steel is the plate. A spigot can still be plastic.
Related comparisons
Sources
Listing prices, stars and review counts are from amazon.co.uk extracts dated 15 October 2026, including the shop page for B0BZPM3DZB. The public sources below cover the ventilation rules and the consumer-rights point.
- Approved Document F, Volume 1 (2026 PDF) (retrieved 15 October 2026)
- GOV.UK: Ventilation: Approved Document F (retrieved 15 October 2026)
- Welsh Approved Document F, Volume 1 (retrieved 15 October 2026)
- Manrose CF100 installation sheet (retrieved 15 October 2026)
- Planning Portal: extractor fan rules (retrieved 15 October 2026)
- Mesh Direct: insect mesh (retrieved 15 October 2026)
- Consumer Rights Act 2015 (retrieved 15 October 2026)
- amazon.co.uk: Vent Systems cover B0BZPM3DZB (retrieved 15 October 2026)
This article contains affiliate links. If you buy through these links, we may earn a commission at no extra cost to you. The comparison uses amazon.co.uk listings and public UK sources. It is not a lab test, and it does not promise the cheapest price.