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How to install the DoorSense Fire Door Retainer

There are times when it is necessary to temporarily leave a fire door open, i.e. for deliveries or possibly even for ventilation, and the Doorsense offers a legal way to do so.

This clever device from UNION will safely hold the door open, however will instantly release it in the event of a fire to fulfill your legal obligations.

See the full details on our website - https://www.insight-security.com

or see on on the video - https://www.insight-security.com/union-doorsense-fire-door-releaser