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Old 03-16-2013, 07:56 PM   #1
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1.5 ton duct


i'm going to be installing a new duct system in the attic.900 sqft house 1.5 ton unit.total trunk line going to be about 20ft what size should my trunk line be? there will be about 6 6inch runs...thanks

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Old 03-16-2013, 11:12 PM   #2
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1.5 ton duct


To properly size your truckline you would have to calculate the duct size for your equipment. Your best bet is first to buy a manual d book and use that to size your ducts. Its not that hard and people on this forum can guide you. I have done it a few times and its pretty easy. Pretty much once you understand what information you need then all you do is get the friction rate loss and then plug that into a ductulator to size your ducts correctly to your equipment.

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Old 03-16-2013, 11:57 PM   #3
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1.5 ton duct


I'd be just as interested in thew return duct system.Its not too hard to warn a 900 sq house unless you don't have a proper reurn for each room.
I'm thinking that you will need a 14x8 supply trunk and a 18x8 return trunk with a 20x8 buffalo boot.Going 20x8 on the return trunk to match up with the boot will also be fine.Its really hard to be too big on the return.
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Old 03-17-2013, 06:28 AM   #4
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Better off with 16X8 for the supply. Allows for the air that those six 6" flex supplies won't carry.
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Old 03-17-2013, 09:19 AM   #5
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should I reduce the trunk line after the first couple of supplys?
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Old 03-17-2013, 09:22 AM   #6
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Not if its less then 24 foot long.
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Old 03-17-2013, 11:09 AM   #7
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1.5 ton duct


thanks guys
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Old 03-19-2013, 07:16 PM   #8
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how many cfms does a 6 inch flex carry next to a 7inch flex duct,,,is there much of a difference?
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Old 03-19-2013, 08:03 PM   #9
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6" 65cfm
7" 95cfm
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Old 03-19-2013, 09:21 PM   #10
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so what size ceiling boot would I use for a 7in duct?, also for a 6inch duct
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Old 03-19-2013, 09:34 PM   #11
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Are you looking at square or rectangular registers.

Rectangular, use 4X10. Square use 6" for 6", and 7 for 7.

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