Regulation · Standards

Understanding BS EN 50291 for carbon monoxide alarms

6 May 2026 · 6 min read

How BS EN 50291 governs carbon monoxide alarms and what it means for specification.

Why CO detection matters

Carbon monoxide is a colourless, odourless gas. Reliable detection certified to BS EN 50291 is an essential layer of protection in homes with fuel burning appliances.

What the standard requires

BS EN 50291 sets performance and reliability requirements for carbon monoxide alarms used in domestic premises, including sensor accuracy and end of life behaviour.

Specifying CO detection

Position CO alarms in line with the standard and manufacturer guidance, and consider interlinking CO detection with the fire system where appropriate.

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