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Duct Construction and Uses
Discussion in fabricating and use of products that move air including spiral pipe, duct board and typical sheet metal work.
       


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  #1  
Old 03-01-2012, 10:15 PM
Bestor Bestor is offline
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Default Fire damper question

Hoping some other tin bashers might have some insight on this one...

I need to install a fire damper in a hallway wall which terminates with a grille into the hallway. I am planning to use a reversed retaining angle on the grille side to keep it flush to the wall. Standard practice and manufacture requirements call for the retaining angle to be 1.5"x1.5" but the largest flange I can find for a grille is 1.25" leaving a 1/4" of the retaining angle showing around the grille.

Does anyone have any experience with this sort of situation?
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Old 03-02-2012, 05:05 AM
wmckane wmckane is offline
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How about putting the damper in a sleeve to suit the depth of the wall, plus enough for whatever type of connection you are using? Turn out the flange you need for the grille. Slide it into the wall in the hallway and fasten from the blind side by using angle to frame the four sides.

Bill
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Old 03-02-2012, 06:51 AM
Bestor Bestor is offline
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Bill, thanks for your suggestion. If I used a 3/4" flange on the sleeve then everything would work but what I'm not entirely sure of is whether this is an acceptable option for the fire damper rating.
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Old 03-02-2012, 09:12 AM
device device is offline
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Default hmm

you can shorten the flange if you use heavier gauge for the angle!
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Old 03-02-2012, 04:38 PM
TSW TSW is offline
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We have done the same thing Bill has suggested above many times, the only trick is to be sure to use the factory sleeve and follow the manufacturer's installation instruction's. Most of the damper manufacturer's we have used will allow a 3/4" flange turned out on the sleeve, as long as the damper/sleeve doesn't exceed certain size limitation's..
Hope this helps.

Terry
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Old 03-02-2012, 10:53 PM
Bestor Bestor is offline
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Thanks for the help everyone - I think I'll pursue the factory sleeve option.
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Old 03-05-2012, 06:09 AM
tnbndr tnbndr is offline
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Ruskin makes a fire damper specifically for this application.

Check out http://www.ruskin.com/model/FD35G.
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Old 02-07-2013, 01:11 PM
basheroftin basheroftin is offline
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you can use a larger flange if the duct is installed before the drywall goes on that way it gets covered. We have also gotten away with 3/4 flanges hundreds of times (if drywall is on already). Another fire damper option would be to use an opposed blade balance/fire damper which attaches to the back of the grill, can't remember if EH Price makes them...?
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Old 02-14-2013, 01:27 PM
cactassdupree cactassdupree is offline
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Wink Fire dampers

I might have missed it ,but do ya'll use break-away connections on your fire dampers. They've been making us do it for years now. Seems as though they were concerned about the fire getting to the hangers or fasteners and the duct falling and pulling the damper out of the wall. dupree
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Old 02-16-2013, 01:18 PM
TSW TSW is offline
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Yes, we use s-lock all around with a max. of 2 sheet metal screws in the top s-lock. This is what most of our inspectors require. Also I think you can use DuctMate with a certain number of clips and no bolts, but I don't remember for sure on the clip configuration or how many.

Terry
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