choosing proper friction rate for flex duct
choosing proper friction rate for flex duct
(OP)
i am using a standard trane ductulator ,hand held slide type,and have been using an 0.1/0.2 friction rate to calculate duct size.
My issue is this,id like to find one rate to use as a standard for a rule of thumb type process and if its not the correct rate what is a good one to choose?
I am a Texas contractor and i am using r-6 flex duct in mostly residential applications..
can someone help?
TIA
My issue is this,id like to find one rate to use as a standard for a rule of thumb type process and if its not the correct rate what is a good one to choose?
I am a Texas contractor and i am using r-6 flex duct in mostly residential applications..
can someone help?
TIA





RE: choosing proper friction rate for flex duct
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Good Luck
RE: choosing proper friction rate for flex duct
design pressure drops for residential and light
commercial duct systems are 0.10 in. w.g. for the
supply side of the system and 0.05 in. w.g. for the
return side of the system. In some cases, particularly
in light commercial systems, 0.08 in. w.g. is used for
the return side. This reduces the overall pipe sizes
in the return duct system, but also results in higher
velocities and may increase noise levels. If system
noise levels are of importance, the design pressure
drop of 0.05 in. w.g. should be used.
RE: choosing proper friction rate for flex duct
The older Hart & Cooley catalog (1995/1996)had the following title
"Flexible Duct Air friction Chart" which is now labeled on their web site as "Air Friction Chart"
Quick glance yields that the two charts are the same.
RE: choosing proper friction rate for flex duct
thanks
RE: choosing proper friction rate for flex duct
RE: choosing proper friction rate for flex duct