too many 90 elbows???

Old 10-29-05, 06:12 PM
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Join Date: Oct 2005
Location: United States
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too many 90 elbows???

i have a ductwork running from furnace room trough crawlspace insulated but cold for LR Dr Kt, 6 registers, and from the furnace to crawlspace is short distance have 4- 90 degree elbows ,is this could be the culprit that temp is 4-5 degree from tstat location which is on corner of halway ,not enough pressure air?.
Also how shall i insulate the duct in crawlspace is high , drywall on cieling ,brick walls 2 went -windows i close in winter ,also this is A/C system too.
What type of insulation i need ,so it not ruine it in sumemr is humid there.
System is Carrier 58 MVP 100 , 3 ton 13 SEER .

Last edited by gyuri; 10-29-05 at 08:03 PM.
Old 10-31-05, 12:00 PM
Join Date: Jul 2005
Location: Ottawa, Canada
Posts: 857
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I do not quite understand your questions, but I will try to respond to a few of them.

You can perform a test to determine if your air flow is appropriate, see the link below for instructions.

Each 90 degree elbow adds an additional 10 feet of length to your ductwork. See the link below for more details on how each type of ductwork affects airflow.

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