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Old 11-27-2010, 03:08 PM   #1
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tying dductwork from new addition to existing house

i bought a new double wide a couple years ago. want to keep house smoke free. ( my wife still smokes ) i built a room on back for that purpose. 12'x12' i tried to tie flex duct in to existing duct . think i was to close to furnace . didn,t get the air flow . i gave up. now winter is upon us again . any suggestion would be greatly apprecidiated. i have framed houses last 30 yrs have some knowledge at hvac . but not the actual instalation . thanks jim


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Old 11-27-2010, 03:35 PM   #2
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My wife doesn't smoke....I do....I have to go outside rain or shine


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Old 11-27-2010, 04:34 PM   #3
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Keep your take offs 2' or so from any change in direction or reducer.
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Old 11-27-2010, 06:54 PM   #4
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If your trying to keep thew house smoke free. then get a PTAC, or some other source of heating and cooling for that addition.

If you use a duct from the main unit. then it will also cause air from the addition to be forced back into the home. And you won't have a smoke free home anymore.
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