Join Date: Dec 2011
Posts: 99
CANADA
04-12-18, 10:30 AM
#1
Round to rectangular duct change
When switching 5" round duct to 3 1/4x10" rectangular duct, is it okay that the area of the rectangular duct is greater than the area of the round duct or does that present a problem? I get that they should be equal at minimum but is it okay to go bigger? I only ask because that size rectangular duct is the most available at local stores. Will have it fabricated if it is an issue. Thanks.
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Join Date: Mar 2003
Posts: 16,684
NC
04-12-18, 11:01 AM
#2
If you're just moving air going from a smaller to larger duct is not an issue. It's only a concern, usually in industrial applications, when you're transporting something in the air like grain or dust and you want to keep the velocity up. But in something like a HVAC system the lower velocity in a larger duct can be more efficient.
Join Date: Dec 2005
Posts: 5,582
VA
Join Date: Dec 2005
Posts: 5,582
VA