[coldinil]

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.

 

[kenmac]

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

 

[hvaclover]

Furnace in garage must be elevated at least 18" off the floor.

 

[kenmac]

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 :no: they are they love to play god when you are in their area

 

[beenthere]

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.