Rectangular vs. Round Takeoffs


Old 02-05-03, 11:04 AM
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Rectangular vs. Round Takeoffs

I'm installing a couple of branches to feed my newly finished attic. I want to tap into the main trunk line in the basement then go up thru some interior walls.

Would it be ok to tap off the main with rectangular take offs, adapt to round, then route insulated flexible round ducting to the base of the walls (to meet the risers), as long as both the round connector duct and rectangular ducts (in the walls) are of the same cfm load (e.g. 6" round ~= 3x10 rect)?

My current trunk line and main branches in the basement are all square or rectangular, and routing the new take-offs with angled rectangular ducts will be quite a challenge. I'm ok with the new stuff looking different than the old, but I need to know if there is some standard out there before I start punching holes in the main assembly downstairs.

(I know I need to follow rules for returns, cfm requirements, etc., per the "Ask the Ducthead" FAQ)

Thanks in advance!
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Old 02-05-03, 11:58 AM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
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duct work

I would use a round 6"takeoff out of your duct and run a 6" pipe over to the hole in the floor going up. Here use a 90 d boot 6" x3 1/4" x 10". then up in the wall use a wall stack 3 1/4" x 10". then to what ever you use for the reg. ED

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