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Old 03-13-2012, 01:32 PM   #1
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Hello, I'm trying to calculate some duct work from my attic, through the 2nd floor and into a room in the first floor. It's a split tri level house.

The room I'm trying to run ductwork to is a total of 430 square feet. I'm guessing I actually need about 384.6 cfm. I've installed one 10 X 3.25 stack so far which will give me about 100 cfm. That means I need to get about 284.6 cfm more down to this room.

Can I run (2) 6" flex hoses down with 4 X 10 boots to get me the 284.6 cfm? Or maybe I could do 1 eight or seven inch flex pipe run down and split is off to (2) 6" in the ceiling of the first floor?

Any thoughts on what would be the best way to run the main duct work down? I can do a small square build out (12 X 12) in a corner of one of the upstairs rooms to get the duct work down if I need to. I'm just not sure what type of main duct to run to the first floor and how to split it off to get at least 2 vents for 284.6 cfm. I just don't want to end up running 3 more 10 X 3.25 stack vents and have to bust open more walls.

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Last edited by kingbuggy; 03-13-2012 at 01:35 PM.
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Old 03-13-2012, 01:43 PM   #2
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If you run two 8" flex it will get you close. I would prefer hard pipe if I were you.
6" flex absolutely will not do the job

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Old 03-13-2012, 01:46 PM   #3
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Thank you Patrick. What size hard pipe would you recommend to do the job? Maybe I could use a round pipe.
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Old 03-13-2012, 07:34 PM   #4
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One ten inch round hardpipe would do the trick
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Old 03-14-2012, 04:33 PM   #5
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Wait a minute.Where did you get a required cfm??
Also what size4 is the return air,or have you learned how to blow air into a soda bottle without getting rid of the air already in that bottle??
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