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Best carbon filter for a grow tent in this UK set

Updated: October 2026

You want a shortlist, not another hour of tabs, and you want it limited to the eleven amazon.co.uk listings in this comparison. The best carbon filter for a grow tent in this UK set means the top pick and the best value inside that table, with a reason to skip each row. Scores weigh amazon.co.uk evidence, duct and kit fit, and shelf price. They are not a laboratory odour test, and they are not a claim about every filter on the UK market. The full rows are on the [carbon filter grow tent comparison](/hub/raised-beds-greenhouses-and-compost/carbon-filter-grow-tent). Prices are the October 2026 scrape, in GBP. A qualifying purchase through those links can earn Products Compared a commission at no extra cost to you.

You want a shortlist, not another hour of tabs, and you want it limited to the eleven amazon.co.uk listings in this comparison.

Our top picks

AC Infinity AC Infinity 100 mm carbon filter

Best overall

AC Infinity AC Infinity 100 mm carbon filter
9.0/10about £47.99
View offer
AC Infinity AC Infinity 150 mm carbon filter

Best value

AC Infinity AC Infinity 150 mm carbon filter
9.0/10about £65.99
View offer
MARS HYDRO Mars Hydro 4 inch carbon filter

Rank 3

MARS HYDRO Mars Hydro 4 inch carbon filter
7.3/10about £27.92
View offer
On this page
  1. 1.How this shortlist was scored
  2. 2.Top pick: AC Infinity 100 mm
  3. 3.Best value: AC Infinity 150 mm
  4. 4.Runners-up when the tent or the box is different
  5. 5.Who should skip a row

How this shortlist was scored

The method on the comparison gives 40 points to listing evidence, 35 to how well the row fits a ducted tent, and 25 to price. Star ratings are marked down when the UK-tagged reviews in the raw file are thin. A global 4.7 from thousands of ratings still counts, and it does not count as 9,697 British buyers. The highest score is the top pick. The best value mark sits on the other 90-point row, the 150 mm filter whose diameter matches the tent size UK guides actually describe. Nothing else in the set carries a badge. Two AC Infinity filters tie on points. The 100 mm AC-DCF4 at about £47.99 is the top pick. The 150 mm AC-DCF6 at about £65.99 is the best value because a typical 120 cm tent is a 6 inch problem. A 60 cm cupboard follows the top pick. A 120 × 120 cm footprint follows the best value.

Top pick: AC Infinity 100 mm

The top pick is the AC Infinity Air Carbon Filter 100 mm, ASIN B07GSKFBL8, at about £47.99. Bullets quote 210 CFM, Australian RC412 charcoal at 1200+ IAV, a 38 mm bed, aluminium flanges and a clothed pre-filter. The captured weight is 2.48 kg. The amazon.co.uk line is 4.7 from 9,697 ratings. Eighteen reviews in the raw file are tagged United Kingdom, and they often praise build and odour control on tents small enough for this flange. Reviewers report faint odour when the fan runs hard, and one UK review describes black carbon dust after recirculating paint fumes indoors. This filter is the wrong object if your fan is already 150 mm or 200 mm. The buying guide keeps law and diameter ahead of this shortlist.
AC Infinity AC Infinity 100 mm carbon filter

Testsieger

AC Infinity AC Infinity 100 mm carbon filter
9.0/10about £47.99
View offer

Best value: AC Infinity 150 mm

The best value row is the AC Infinity 150 mm filter, B07GSKTT86, at about £65.99. Bullets quote 410 CFM, a clothed pre-filter and mounting straps, and the weight is 4.63 kg. The rating line matches the 100 mm sibling, 4.7 from 9,697, with 18 UK-tagged reviews that mention pairing with CLOUDLINE fans. UK sizing pages commonly put a 120 × 120 × 200 cm tent on 150 mm duct once you add the filter allowance. You pay about £18 more than the top pick and you buy the diameter those pages name. You still supply the fan. If the fan you own is already 150 mm and healthy, about £65.99 is the rational carbon spend. If the fan is 100 mm, do not reducer your way onto this flange.

Runners-up when the tent or the box is different

Mars Hydro’s 4 inch filter, B09QBS8NLG, is about £27.92 with a 210 CFM bullet, 4.5 from 148 ratings and 12 UK-tagged reviews. It is the budget 100 mm choice when the volume maths stays on 4 inch and you accept a smaller evidence base than AC Infinity. Hon&Guan’s 4 inch, B0DT3QVYDP, is about £29.99 with 4.0 from 259 ratings and 39 UK-tagged reviews, the largest UK sample and the weakest stars in the set. For 150 mm on a tighter budget, HG Power’s 6 inch is about £33.99 and Mars Hydro’s 6 inch is about £40.38. The only 200 mm filter is the AC Infinity XL, B09TQ1HP7W, at about £119, with a printed weight of 454 g that is not a credible mass for the cylinder.

Who should skip a row

Skip every 100 mm filter, including the top pick, when the tent is about 120 cm square or the fan is already 6 inch. Skip the 150 mm best value when you are still on 100 mm duct and you do not want to replace the fan. Skip both kits when you own a matched fan, and skip them when you need UK buyer comments before spending about £170. Skip the 200 mm XL unless the duct is already 8 inch. None of these skips is a verdict on brands outside the eleven ASINs.

Common questions

Which filter is the top pick in this table?
The top pick is the AC Infinity 100 mm filter, B07GSKFBL8, at about £47.99, with 4.7 from 9,697 amazon.co.uk ratings and a 210 CFM bullet. The badge applies inside this comparison only. It is the wrong flange for a tent that UK guides size at 150 mm.
What is the best value for a 120 cm tent?
The best value row is the AC Infinity 150 mm filter at about £65.99, B07GSKTT86, with a 410 CFM bullet. A 120 × 120 × 200 cm tent is the footprint those UK guides usually move off 100 mm duct. You still need a 150 mm fan.
Is AC Infinity worth more than Mars Hydro here?
On 100 mm, AC Infinity is about £47.99 against Mars Hydro at about £27.92, both with a 210 CFM bullet, and AC Infinity carries 9,697 ratings against 148. On 150 mm the gap is about £65.99 against about £40.38, again with a 410 CFM claim on both listings. You pay for the review file and the brand’s mounting kit, not for a lab result we do not have.
Should I buy a fan kit instead of the best value filter?
Buy a kit if you do not own a 150 mm fan. The VIVOSUN G6 is about £169.99 and the AC Infinity CLOUDLINE LITE kit is about £189. Both lack UK-tagged reviews in the raw files. If the fan is already in the tent, the filter at about £65.99 is the cheaper carbon.
Who should skip the cheapest 100 mm filters?
Skip Mars Hydro, HG Power and Hon&Guan 4 inch rows when the tent is 120 cm class or larger, or when you need the AC Infinity review depth. They are entry prices for a small cupboard or a printer cabinet on 100 mm duct, not a shortcut onto a 4×4 footprint.
Does the 9,697 rating count as UK opinion?
No. That figure is the amazon.co.uk listing line and it is predominantly global. The raw files for the two leading AC Infinity filters contain 18 reviews tagged United Kingdom. Read those before you treat the stars as local experience.

Related pages

Carbon filter size for a tent

Filter or fan kit

Carbon filter grow tent

Carbon filter buying guide for a UK grow tent 2026

How to install a carbon filter in a grow tent 2026

Sources

Public UK sources for sizing, licensing and electrical safety, last checked on 20 October 2026. Amazon.co.uk listing lines are the price and review source for the eleven ASINs. No laboratory odour test was run.

  1. Greens Horticulture — grow tent fan and carbon filter size (retrieved 20.10.2026)
  2. Hydroponics UK — carbon filter sizing guide (retrieved 20.10.2026)
  3. The Growers Shop — grow room ducting size guide (retrieved 20.10.2026)
  4. Roots2Riches — extraction fan calculator (retrieved 20.10.2026)
  5. Misuse of Drugs Act 1971, section 6 (retrieved 20.10.2026)
  6. GOV.UK — cannabis licensing factsheet (retrieved 20.10.2026)
  7. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 20.10.2026)
  8. London Fire Brigade — cables, fuses and leads (retrieved 20.10.2026)