Last edited 28 Oct 2019

Automatic release mechanism

Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), defines an automatic release mechanism as:

A device that normally holds a door open, but closes it automatically if any one of the following occurs.

NB Approved document B previously defined 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:


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