Tony wrote:
> Again, this is a down flow furnace out of a mobile home.  Just noticed
> it says "Sealed Combustion" and my insurance company said it's OK for
> me to use it in my garage.  Down flow, so I'll weld a stand for it to
> sit up off the floor about 8".

> Question about flue exhaust and fresh air inlet.  This is an 80% unit
> (I'm guessing 57K BTU's out divided by 70K BTU's in = 81%? )

> Can this be used with the flue exhaust/air intake being terminated on
> an outside wall similar to 90% units but metal, not PVC?  Or must
> this flue go a certain number of feet higher than the roof?  Or
> something in between the two?