180 degree turn in duct work

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Old 12-18-07, 03:46 PM
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180 degree turn in duct work

Im thinking of putting a supply outlet at the bottom of my stairs to add some heat to a cold entry way. Most outlets Ive seen are 90 degree turns and come out the floor. Would it be a big problem coming out the bottom step? That way, I wouldnt have to cut the tile in the floor.
It would be about a 35ft run. 10 ft off the supply to a 90, 25 ft to a Tee, then 10ft both ways to one floor vent and the new vent to be added.
Ideas on duct size?
 
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Old 12-18-07, 10:49 PM
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Wink

Id say no air will come out of it. I get 10 ft + 5' for the
90o +25" +5 'for the T +10 to the reg. I get 55' run
Lot of times you can think a 8" pipe to the T then 2 --6"pipe out of it.
 
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Old 12-19-07, 10:53 AM
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Hmm, I think it will actually be more than that now. Wasnt sure what the fittings accounted for. I would need to add another 2 elbows to run the straight pipe under the floor joists, since they are perpendicular to the run. I can remove the Tee and just have a dedicated line from the trunk.
Looks like Ill cut into the tile with two options
1. Using an end boot and putting the register on an outside wall. Longer run, extra elbow but no water pipe to move.
2. using a straight boot and having the register on an inside wall. Slightly shorter run, one less fitting but I would have to move one water pipe (not a big deal, just a PITA).
 
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