Fire door damper

Mar 21, 2015 23 Replies

You know the soft close cabinet buttons?



Is there a heavy duty version that can be set in the frame or the back of a door.



I have a door with an inbuilt firedoor closer (required) but it doesn't half slam it shut.



I was wondering if there was a hydraulic button type that could catch and absorb the energy over the last few inches of closing?



Googled - but nothing...


I'd have thought that anything like that would be viewed as having the potential to defeat the closer ... would a blade-type intumescent strip "catch" the door sufficiently to stop the slam?

I was thinking "hollow rubber semicircular strip"...

I did find an adjustable concealed closer, with adjustable speed and latch action. By bum though, £180!!!

I did mention "regular office style closer" and SWMBO slapped me.

I fitted a regular office door style closer to a door here. SWMBO helped me fit it.

What about the hinge-side chain closers?

Ah, I've not looked at them closely; I thought the spring might be running out of oomph by the time the door was nearly shut, in fact at several houses I've seen them fitted the chains have been unscrewed ...

They are typically built into the more sophisticated (and ugly/visible) closers with the articulated arm above the door.

You may find that say three Blum type dampers set into the stops would do the trick though. Ditch the supplied mounting brackets and just drill a striaght 10mm hole - pop them directly into the wood with the top of the body flush to the surface. Also easy to replace if they wear.

Most of the cheap sprung closers can be adjusted, and they do pull less hard when nearly closed. However if the door has already got some speed up, its still going to close with a bang.

The cheap sprung closers can be disconnected which solves the noisy closing problem completely.

Can you fit some felt intumescent strip? If that is not possible put a clip on the Perko chain and take the plate off to ease it out a couple of links.

Magnetic damping?

A sheet of Aluminium or Copper (but not steel!) on the floor (under the carpet?) and some powerful pot magnets recessed into the underside of the door may provide enough damping.

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...and loads more examples.

Cheers

The only type I've seen are part of the actual closer, so the force is maintained, but the speed reduced near the end. No idea how they work, rotating fan or something inside the metal box? Brian

"Brian Gaff" wrote in news:mejvp6$dhu$1@dont- email.me:

Proper hydraulic ones usually have two settings - one for closing speed - and one for the firmer latching speed. They need seting correctly.

That's what's fitted and what happens is it builds up a lot of momentum and BANG.

John's idea of a few Blum soft closers could work - as might my fall back of a hollow rubber strip - it just needs something to take the edge off the bang.

This is the adjustable one:

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But - ow...

Sir - I like your style!

I have no idea if that would work on a door, but what an idea...

The old scout bus my school had in the 1980s was an ex mountain bus and had electromagetic damper brakes.

The tension can be adjusted on these.

Jonathan

Really - oh cool.

OK - I'll find out how to do that. I think with a little less ferocity it would be OK.

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I went digging on the Samuel Heath website and came across a nice letter plate, well yes it's nice, but not £225 nice!

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