BS 3621 – Thief Resistant Locks (Key Egress)

This British Standard specifies performance requirements and test methods for a thief-resistant, mechanically operated single-point lock assembly (including locking plates, fixing screws, fitting instructions, cylinders, and protective furniture where appropriate) that: a) incorporates a lock conforming to BS EN 12209 that can be unlocked from the inside without a key thereby only allowing keyless egress, and b) is used in doors, windows doors and entrance doors in buildings.
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Lock Functions and Applications:

Since its inception, BS 3621 has always required security from both sides, meaning that, once locked, a key is always required to open the door, whether from the inside or the outside. Recognising that there are situations in which a keyless egress lock (secure only from the outside) can offer acceptable security, as well as safety benefits.

BS 3621Locked by key from both sidesProvided that the key is removed, this type of lock is secure against operation by intruders reaching through a letter-plate, breaking nearby glazing etc. Best used where emergency escape is not required or where other means of escape exist.

Source: Door and Hardware Federation (DHF) Best Practise Guide: BS 3621:2007 Thief resistant locks assemblies – Key egress

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