Door guards form an inhibition threshold against using a door by the necessary rotation or movement of the door guard, which triggers a loud alarm at the door. Door guards are therefore usually used on doors that are part of pure escape and rescue routes and are not used for the regular use of the building. A key switch can be used to temporarily release a passage without alarming.
Many door guards cannot be used in accordance with the approval requirements of an emergency exit lock in accordance with DIN EN 179, as the requirement of opening the door "with only a single operation" is not guaranteed. In practice, however, they may still be used on escape doors, provided that there are no provisions of state law to the contrary, as DIN EN 179 is not an established technical building regulation with a legally binding character. In case of doubt, it is advisable to coordinate with the responsible building supervisory authority. There are also patented new approvals, so-called one-hand door guards, which meet the requirement of opening the door with only a single operation when opened and are therefore also approved for emergency exit locks in accordance with DIN EN 179. Door guards are not suitable for panic door locks according to DIN EN 1125.
Source: bauwion
