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Fire Door Keep Locked sign size


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Trying to get a definitive answer for a report on several hundred fire doors which all have signs (Fire Door Keep Locked) and so on that are 42mm in diameter (blue area) these where pre attached to metal door sets when installed 10 years ago.

BS5499-5 states 60mm, which is superseded by BS EN ISO 7010 which states 70mm and I'm being told by "professionals" it is 80mm.

Who is right?


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  • Prometheus changed the title to Fire Door Keep Locked sign size

Usually they are either 100mmx100mm square or 80mm diameter based on what is sold ex-stock by suppliers and I've never seen smaller.

Letter heights on signs used to be set in fire certificates, but now it's usually based on viewing distances and the signage British Standards. If the standard says 70mm considering the 'point blank range' viewing distance the smallest size in guidance would apply - although 80mm is the smallest sign I've ever seen for sale - the ones on sound like specials or made on a label printer.

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