Replacing a 12 V communal keep
You are a householder or landlord swapping a failed 12 V keep on a communal door that already has a nightlatch and a door-entry supply, and the door must stay locked if the supply fails. The SecureMyDoor fail-secure unit is the top pick at about £32.97, with 4.4 from 70 reviews. Instructions are thin, and one apartment fit needed extra chiselling. It is the wrong keep if people rely on that door as the way out in a power cut.














