27/09/2026
A detector can be present, powered and visually unobtrusive, but still need proper attention.
Dust, airborne debris and contamination from cooking, aerosols, building works, decorating or nearby trades can affect device performance. They may contribute to unwanted activations or delayed response.
That is why fire alarm devices should be periodically cleaned, inspected and tested by a competent person as part of a planned maintenance regime.
Good practice includes
✓ Recorded testing and inspections at defined intervals
✓ Cleaning appropriate to the device and environment
✓ Checking that detectors have not been painted, papered over, boxed in or obstructed
✓ A clear record of what was checked and when
Positioning matters too. Detector locations should not be chosen simply to align with downlights or other ceiling fittings. Air-conditioning units and air supply or return points can influence how smoke reaches a device.
The design should consider the relevant UK fire-alarm standard, room geometry, ceiling features, ventilation, access for maintenance and the building's fire strategy. There is no universal fixed-distance rule that replaces a proper site assessment.
A well-maintained system supports early warning but cannot guarantee detection outcomes, prevent fire or guarantee fire-service response.
Kronan is a family-run, SSAIB-accredited business with over 25 years' experience in fire alarm design, installation and maintenance nationwide from Welwyn Garden City.
Arrange a maintenance visit or complimentary property security assessment: 0800 999 1977 | www.kronansecurity.co.uk