Door closers are required on fire rated doors so that the door
will close after somebody has passed through it. The door can then retard the fire as it was meant to.
However, closers are used on many other non rated doors especially with the handicap code.
Almost all closers will have a sweep and latch speed adjustment. The sweep is the movement
of the door from the open position to just before it latches into the frame. The latch is
those last few inches just before the door actually reaches the latch. You can adjust the speed of
either one of these to obtain the results you require. Sometimes you will need the door to close
quickly (not on handicapped doors) and then slow down right before closing to avoid slamming. Other
times you will need the door to close slowly and then speed up at the very end to ensure that it
The backcheck control will let the door open at the normal speed to almost 90 degrees and then
slow the door down for the rest of the opening cycle so that the door doesn't swing open out of
control allowing someone in a wheelchair, for example, to have time to get through the opening.
Some closers are available with the hold open arm feature. This closer will let the door
automatically stay open when it is opened to a certain point. All you have to do is pull the door
a little to make it close normally. If the door is opened to less than the hold open point, it will
close as if it did not have a hold open arm. The hold open arm can not be used on a fire rated
Delayed action closers will hold the door open for a certain amount of time before it starts
to close as a normal door would.
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