FF: Why ask why?
This is the door hardware equivalent of whodunnit...maybe I should start calling these "whydunnit."
QQ: Coordinators on Fire Doors
When a pair of fire doors has manual flush bolts and no closer on the inactive leaf, is a coordinator required?
Spam and a UHP
What's a UHP? An Unidentified Hardware Product that I need your help to identify. But first, a note about spam - and not the canned ham-like version.