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Old 11-14-2009, 03:58 AM   #1
vdu
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Minimum gas for fire stopper


I just install a new duct. Inside the main riser (supply), between floors, I put a cut out piece of metal. However, there is always a gap between the metal and the riser or between the metal and the surrounding area. I saw there is no further insulation other than the metal sheet for the existing flu. My question is what is the maximum allowed gap between the firestopper metal sheet and the riser.

Thanks,

vdu

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Last edited by vdu; 11-14-2009 at 10:43 AM.
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