Furnace supported by wood

[Marc M]

Hey Jerry,
For my own info; I was unable to find anything that stipulates the installation methods of the attic furnace. I was only able to find code that states the unit should be supported according to the manufactures requirements.
CMC states the units shall maintain 6" clearance from the deck(wood).
BTW, Fuel line needs support.
What say you?

[Jerry Peck - Codeman]

Hi Marc,

First, that needs to meet the clearances from combustible material, hence the CMC stating it needs 6 inches from wood.

The manufacturer will also give clearance to combustible material, which includes those wood supports.

The gas line not only needs support, but it also needs a sediment trap too.

And if there is an evaporator coil there, that needs a pan under it which is large enough to catch any condensate running back into that gas furnace (typically means under the furnace too).

[Marc M]

Thanks Jerry.
As far as terms go, does combustion air have the same meaning as make up air?

[Jerry Peck - Codeman]