These 2 terms sometimes cause confusion if you are not in the door business so let's clear it up!

Double acting means the door swings in AND out...versus in OR out for a standard (single acting) door. You'll see this in a lot of restaurants going into the kitchen.

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This can be a single door or a pair of doors. You'll need a special frame for this application called a Cased Open frame. This frame has no stop (like a standard door frame has) so the door can swing both ways.

Double egress is always a pair of doors (never a single door) and allows each door to swing in the opposite direction.

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You will usually see these in corridors and they are frequently used in hospital corridors. These doors provide quick exit/entry from either direction of traffic flow. You'll also need a special frame for this application as you can see in the picture above.

Steve Behrens
http://www.commdoor.com
steve@commdoor.com