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Thread: extending ductwork from crawl to slab

  1. #1
    DIY Junior Member johnapril's Avatar
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    Apr 2006
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    Indianapolis, IN
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    Default extending ductwork from crawl to slab

    I would like to turn our screened-in porch into an interior space. The house is on a crawl space. The porch is on a slab. Is it possible to extend the ductwork from the crawlspace into the walls of the porch area and have the registers on the walls?

  2. #2

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    Possible, yes. But HVAC systems are balanced to some extent; adding registers willy nilly could affect airflow in the rest of the house. Also, a screened porch (I'm assuming) is 3-sides open, which means you need a decent amount of registers to be effective. Further, you might need an airflow return if the doors can close.

    The point is, don't assume it's as simple as adding a register or two. Have an HVAC man come and estimate what needs to be done.
    (important note: I'm not a pro)

  3. #3
    DIY Junior Member johnapril's Avatar
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    Apr 2006
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    Indianapolis, IN
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    Thanks for the response. The porch is only screened from one side. The other two sides are presently occupied by exterior grade sliding glass doors, one into a bedroom, the other into the dining room. The plan would be to remove both sliders, but replace the one to the bedroom with a nice interior grade French door.

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