Air Conditioning - Supply Lines

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jemcdan
09-06-05, 07:02 PM
How many 90 degree elbows can you have in a 6 in supply line off the main trunk , 1200 cfm blower, without a whole lot of restriction.

thanks. :wall:

DNT1
09-06-05, 07:48 PM
a couple of turns usually does not hurt anything, if in doubt upsize to a 8" or 10" line
jemcdan
09-06-05, 07:50 PM
Thanks :wall:

mattison
09-07-05, 05:06 AM
1 - 90º elbow is = to 1 - 5' section of straight.
jemcdan
09-07-05, 05:59 PM
could you explain in a little more detail

thanks :wall:
DNT1
09-07-05, 07:12 PM
I think he is referring to static pressure which is the resistance created by the air trying to move down the duct. Air likes nice smooth straight round duct, it flows along with little resistance in these, if you add a 90 degree elbow or a extra 5 foot length of duct it slows the air (more resistance to movement higher static pressure) additional pressure is required to overcome the static and push the air thru. Use nice smooth round metal duct runs laid out as straight as possible for max airflow, or increase the size to help produce better flow.
jemcdan
09-08-05, 02:57 AM
thanks for the explanation, much more clearer now.

thanks :wall:
mattison
09-08-05, 05:14 AM
Sorry about that. DNT hit it right on.
DNT1
09-09-05, 10:57 AM
just curious what are youi doing adding another line from a trunk line?
jemcdan
09-09-05, 08:51 PM
i just wanted to get them down below the gloor joists. :wall: