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-   -   Insulated flexible heat duct (http://www.diychatroom.com/f17/insulated-flexible-heat-duct-69031/)

DangerMouse 04-14-2010 10:30 AM

Insulated flexible heat duct
 
Any thoughts on using this for the entire job down in my crawl space? I already have it on three runs off the old ductwork I'm removing. The flex part is only a few years old, so I plan to keep it where it is. It'd sure make my job easier, I would think. Anyone know of any on-line tutorials? EZ-install sites or similar?

Thanks guys! I googled it, but didn't find much.
(Searched here too, of course, same thing.)

DM

beenthere 04-14-2010 03:02 PM

Flex can be used for both a trunk line, and for supply branches.
Some areas interpret the code on flexible duct connectors to include flex duct. It doesn't. but those areas won't let you use it for a trunk line.


Flex duct needs to be installed using a flew duct FR chart. Not the standard FR chart for sheet metal.

EG:

6" sheet metal pipe at .08" FR will flow 100CFM.
6" Flex duct at .08" FR will flow 75CFM.

Gary in WA 04-14-2010 03:04 PM

I know you need the next size up and the flex should be no sharp bends and stretched out to be efficient: http://rockwallcontrols.com/Resident...ag=air-ducting

http://www.mmmfg.com/pdfs/True_Cost_...x_10-27-06.pdf

http://www.thefreelibrary.com/Pressu.....-a0201591046

Be safe, Gary


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