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Old 03-24-2009, 10:34 PM   #1
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Ducting question?


Put a new furnace in my garage. It is a upflow Lennox model. I was wondering if it is worth the effort to run ducting from the plenum down to the floor and then coming out at a 90 angle or just run a couple elbows out the top. It would be nice to have heat at floor level but not sure if it would just rise so fast it wouldnt do much good.

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Old 03-24-2009, 11:20 PM   #2
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Ducting question?


If the furnace is gas & it is sitting on the garage floor. make sure the return air & furnace itself isn't able to draw in any flammable vapors.. ells etc on the top should be fine for heating a open garage area

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Old 03-24-2009, 11:49 PM   #3
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Ducting question?


Furnace in garage must be elevated at least 18" off the floor.
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Old 03-25-2009, 12:18 AM   #4
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Ducting question?


John , kinda funny how it is in different areas.. They don't make you install a furnace 18'' off the floor here in any city / county limits.. Some cities / counties make you install the new style flame guard water heaters 18'' & some don't...Code states that if it'e a flame guard style water it doesn't have to be on a stand......Inspectors they are they love to play god when you are in their area
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Old 03-25-2009, 05:52 AM   #5
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Ducting question?


For what ever dumb reason.
Some inspectors do consider a water heater with flame guard as a source of ignition.

All sources of ignition must be min 18" above floor in a garage.
A blower motor is a source of ignition.


Not enforced in all areas.
But that doesn't make it right not to raise it.
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