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All installations and services must be performed by qualified service personnel.
21
DO NOT! SILICONE OR SEAL
THIS CONNECTION IN
ANYWAY. MUST BE LOOSE
FIT WITH LEAKAGE BETWEEN
PVC AND METAL COLLAR.
Figure 12: Typical Internal Air Intake Piping Arrangement for All Furnace Models
d. After trial fitting the entire combustion air intake system, use a PVC cement to glue all
connections in place,
except the length of pipe between the combustion air fitting on the
burner box and the first fitting.
e. 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-inch thick, foil-faced fiberglass
insulation, or an equivalent product, to help prevent the outside surface of the pipe from
sweating.
H. Connecting The Furnace To Roof Exhaust / Intake Terminations
If it is not desirable, or feasible, to vent the furnace through a sidewall, it may be vertically vented
through the roof. Installation shall conform to the following guidelines, which are illustrated in Figure
13, below.
1. The outlet of the exhaust vent and the inlet of the combustion air intake, i.e. the terminations, shall
be a minimum of 12-inches above highest anticipated sno level.
2. The exhaust vent outlet must be installed a minimum of 12-inches above the air intake inlet.
3. Where exposed to prevailing winds, the combustion air intake shall be installed upwind of the vent
outlet.
4. The exhaust vent and combustion air intake can be a minimum of 3-inches and a maximum of 24
inches apart.
NOTICE:
When the vent termination is installed correctly, a draft should
NOT
be present in the
system during the furnace off-cycle.