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flex duct support

ICE

ICE

Oh Well
Joined
Jun 23, 2011
Messages
12,934
Location
California
There is usually a place or two where the strap has folded and is not 1.5" wide. I didn't see that here.
Do you allow cloth strap for duct support?


 
I frequently see the cloth strapping as pictured and do allow its use. Yes there are times where the straping is folded or pinching the duct, at that point I require the issue to be corrected. More times than not if the duct is pinched it's due to a change in angle and I have no concerns about asking for additional supports and do not encounter resistance.
 
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For a fix to a pinched \ restricted duct, a
Hanger Duct Saddle could be used.

duct_saddles.jpg



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ICE,
ADC Flexible Duct Performance & Installation Standards:

Flexible duct shall be supported at manufactures supported recommendations, not to exceed 5-feet,
not to have more than 1/2-in sag per foot and can be nonmetallic type straps.

You may be a bit saggy looking at your photos, but maybe it meets the manufactures support guidelines??
 
The picture that I used to open this thread does not show any folded cloth strap. I couldn't see any of that from the access scuttle. Had I crawled the attic I most likely would have found a few. I think that over time there will be folded strap as in this picture.


Just knowing that it can turn out like this is reason enough to deny it.
 
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