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Old 07-07-2011, 09:13 PM   #1
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Branching ductwork from a wall stack


While I will most likely seek installation help from professionals, if I may,
I would like to ask some ductwork installation questions so I am better educated when seeking a bid. I have recently purchased a small two story home (1200 sq ft) in western PA, circa 1910. The heating system was compromised quite badly and much of the structure was heated by a combination of electric strip heat and a wood stove. I am considering adding a gas forced air system.

First floor suply ductwork and the first floor return air don't appear to be much of an issue. Of course there is nothing available to the second floor which is approximately 500 sq ft. I can run a stack within a closet through the first floor and even into the attic if needed. I think I have a space about 10" by 24" available for the stack. There are two small bedrooms and a bath on the second floor.

A few questions: (1) Considering heating is of primary concern in western PA, I've always heard that heavier heating needs suggest that floor vents are preferred over ceiling vents. Given that it would be easier to run insulated ductwork through the attic, does this ease of installation give ceiling vents the nod? (2) This next question demonstrates my ignorance. Just how does one branch flexible ducts off the top of a wall stack? I'm assuming I will have as many as 4-5 flexible ducts. (3) Can the only proposed cold air return to the first floor be extended to the second floor and simply opened there (one return stack - two vents, one on each floor).

Many, many thanks.

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Old 07-07-2011, 09:52 PM   #2
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Branching ductwork from a wall stack


2 small bedrooms and a bath shouldn't need much heat, since they are on the second floor, and the heat will rise to them. But, if you plan on getting A/C, then they must be sized for the cooling load. And the duct that runs up to the attic must be sized for that.

As far as the return. Code prohibits the same vertical return chase serving 2 floors. It may or may not be enforced in your area.

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Old 07-07-2011, 10:00 PM   #3
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Branching ductwork from a wall stack


Well it isn't in California, i doubt it would be there...
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Old 07-08-2011, 05:00 AM   #4
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Branching ductwork from a wall stack


Quote:
Originally Posted by vln View Post
Well it isn't in California, i doubt it would be there...
IMC isn't enforced the same everywhere.
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