All installations and services must be performed by qualified service personnel.
19
NOTICE:
The air intake pipe must be supported every 4 feet. After making sure
the length of the piping is correct, glue all connections in place except the
connection to the burner box.
If the combustion air piping is installed in a warm humid place, such as a laundry
room or above a suspended ceiling, it must be insulated with a 1.0” foil faced
insulation or its equivalent.
If the vent piping is run through an unconditioned space, it must be insulated with
a 1.0” foil faced insulation or its equivalent.
:
Outside combustion air must not come from an area that is
directly adjacent to a pool, hot tub or spa. Measures should be taken to
prevent the entry of corrosive chemicals or vapors to the combustion and
ventilation air supply. Such chemicals include but are not limited to
chlorinated and/or fluorinated hydrocarbons such as found in refrigerants,
aerosol propellants, dry cleaning fluids, degreasers and removers. Other
harmful compounds may come from bleaches, air fresheners or mastics.
Vapors from such products can form acid compounds when burned in a
gas flame. Should acid compounds form in your furnace, it may reduce the
life of the furnace.
H. Direct Venting Through a Sidewall
1. Vent And Combustion Air Pipes
Vent and combustion air pipes may pass through a maximum wall thickness
of 18 inches. The minimum wall thickness is 2 inches. Referring to Figure
7, the maximum distance from the outer wall to the center of the elbow is 12
inches.
