Automatic release mechanism
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Approved document B, Fire Safety, Volume 1 Dwelling houses, defines an automatic release mechanism as:
A device which will allow a door held open by it to close automatically in the event of each or any one of the following:
- detection of smoke by automatic apparatus suitable in nature, quality and location;
- operation of a hand-operated switch fitted in a suitable position;
- failure of electricity supply to the device, apparatus or switch;
- operation of the fire alarm system if any.
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