return duct size


Old 10-16-19, 08:35 AM
Thread Starter
Join Date: Oct 2019
Posts: 1
Received 0 Votes on 0 Posts
return duct size

I'm getting my heat exchanger replaced through my home warranty and they approved the repair however the repair company wont do the repair until I agree to a suggested repair to my return duct. I have asked why and they say because its a 10" return and should be 12". The house currently has two returns one 20 x 20 and one 14 x 20 for a 3 ton unit. Is this suggested repair needed?
Old 10-17-19, 12:31 PM
airman.1994's Avatar
Join Date: Dec 2005
Location: VA
Posts: 5,795
Received 8 Votes on 8 Posts
20x 20 is good for 2300 cfm at .05 static and 20x14 is good for 1400 at .05 static that's good for a 9 tons of air Not sure what the 10in and 12in duct is for.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: