Installing New duct work

Old 02-27-04, 12:47 PM
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Installing New duct work

I want to install a hot air furnace and a/c in my 1000 sq ft rancher. I have no existing duct work. How can I figure out what size duct work I need to use. I plan on putting in a 2 ton unit. I bought a ductolator, but I am not sure how to use this. Any help will be appreciated.
Old 03-01-04, 10:56 AM
hvac4u's Avatar
Join Date: Aug 2001
Location: NW atlanta
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typically you have 800 cfm to work with. use a trunk line that acccomodates this and reduces after take offs, helping to maintain static pressure. add up the ducts you plan to take off it and using the ductulator, run the duct accordingly.
kind of vague, give us more info. attic, basement or crawl? how many rooms? did you do a heat load? you want to be sure the unit is properly sized
Old 03-01-04, 12:14 PM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
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Like hvac4u said need more info 800 cfm for 2 ton ,duct start out with 120sq" very tight job ,tops about 160sq" same for the cold air return.ED

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