Adding duct for addition and canít follow the 2 foot rule


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Old 08-27-22, 05:15 PM
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Adding duct for addition and canít follow the 2 foot rule

Hi, if Iím adding duct 10Ē to run to the attic
in 3 ton down flow furnace when all ducts are in the crawl space
that the opening will be exactly under the coil but very close to it at the base can ( I cannot / have no space to have 24Ē inch run/space and than to cut the opening) so the opening again will be very close
1) how much cfm will be in that 10Ē duct metal round
will it be around 300 cfm
2) also do I need to insert like 45 elbow inside the can base to direct the flow to that duct
or just open that base can and 90 elbow from the base can will be enough
 
 

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