The knowledge centre
Nine guides that together cover everything a homeowner, installer, specifier or buyer needs to know about smoke alarms — written to be read in order, but each one stands alone.
1 · How smoke alarms work
Optical, ionisation, dual-sensor and heat detection: what is inside the chamber and what each technology reacts to fastest.
Technology2 · Types of smoke alarm
Standalone, mains-powered, interlinked, wireless, smart, heat, CO and system detectors — and what the Grade A–F language means.
Devices3 · Alarm or detector?
Two words that are used interchangeably and should not be. Why it matters when you order parts or read a specification.
Terminology4 · Installation
Ceiling spacing, the 30 cm rule, dead-air zones, sloped ceilings, room-by-room guidance and the places to avoid.
Placement5 · Maintenance & testing
Weekly tests, six-month cleaning, battery strategy, the 10-year sensor limit and a simple record sheet.
Keeping them alive6 · False alarms
Why alarms cry wolf, how to silence one without disabling it, and the decision tree that ends the 3 a.m. beeping.
Nuisance alarms7 · Standards & regulations
EN 14604, EN 54, UL 217, UL 268, GB 20517, AS 3786 — plus what the law now requires in homes across Europe, North America and Australia.
Compliance8 · Buying guide
How to read a specification, spot a fake certificate, and decide what is worth paying for over a ten-year life.
Purchasing9 · Interactive toolkit
Knowledge test, coverage calculator, placement checker and product selector — apply everything above to your own building.
PractiseThe three ideas that matter most
- Warning time is everythingModern furnishings burn an order of magnitude faster than the legacy furniture the first domestic alarms were designed around. A room can reach flashover in under three minutes. Detection must happen in seconds, not minutes.
- Placement beats specificationA mid-range certified alarm in the right position outperforms a premium alarm in the wrong one. Dead-air corners, draughty spots next to air-conditioning vents and kitchen proximity ruin more installations than cheap hardware.
- A device is only as good as its maintenanceSensors contaminate, batteries die, units expire. The single most common reason a smoke alarm fails to sound in a real fire is that somebody removed the battery months earlier and forgot about it.
Nothing here replaces the fire code that applies in your jurisdiction or the installation instructions supplied with a specific product. Where the two disagree, the code and the manufacturer's instructions win.
New to the subject?
Start with the technology page, then read installation. Those two account for the overwhelming majority of real-world problems — wrong sensor, wrong position. Everything else is refinement.
Begin with how smoke alarms work → · Then go to installation →