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Old 03-16-05, 02:13 PM
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Hi
I have added a 16x21 additon to my home. I am adding two 6" hot air runs and a 6" cold air return. To get through from old to new I have to have my runs drop down two feet and then come back up two feet. By doing this I need to use four 90's on each run. How much air flow will I lose by using that many fittings and can I use 6" rounds for a cold air return?
thanks for any help that I can get.
 
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Old 03-16-05, 03:52 PM
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Wink

You kind of look on a 90oL as about 5 ft more of drag, Can you make them 45oL.
Dont know where you are are what the heat lose and AC load of the room is but 2 6" pipe for a 16X 21 dont sound right and with all the elbows. A 6"pipe is like 100cfm is all
Yes you can use 6 " pipe for cold air return. But cant you just pan a joist.

ED
 
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Old 04-01-05, 02:41 PM
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Thanks for the reply.
Yes I can use 45's instead of 90's.
I live on Vancouver Island B.C. Our weather is very mild and a short winter with lows of around 0 degrees. All of the existing ducts are 5" so hoping that the two 6" will work along with one cold ari return.
 
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