# 45465K005
Page 11
Liner
Masonry
Chimney
Cleanout
Masonry Chimney Venting
Figure 12
Factory-Built
Chimney
Cleanout
Factory-Built Chimney Venting
Figure 13
and for more information on the provisions for fresh air to
furnaces, refer to the latest edition of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
Do not cement air intake into the connector on burner
box. Use high temperature RTV silicone sealant so
intake pipe can be removed if service is required.
The following venting options are available:
1.
The vertically vented furnace can have “Fresh Air”
brought directly to the inlet (see Figure 14) by means
of a 2" or 3" plastic (PVC) drain pipe, schedule 40
Figure 14
Typical Installation
Vertical Vent with Outdoor Fresh Air
Keep inlet
away from
obstructions
Max. 65'*
6" Min.
Height to provide
12 clearance to
average snowfall
"
PVC Inlet
Pipe
See Chart
Approved Vent
System
* Equivalent vent length
PVC, ABS, single wall galvanized, or single wall
stainless steel pipe (see Table 1). This configuration is
for informational purposes and might not exactly
reflect your installation. Some modifications may be
required to accommodate the unit location, inlet pipe,
and building structure. The inlet pipe must be free
from any obstructions and anticipated snow fall, since
all air for combustion is through this pipe.
* The inlet air lengths listed are maximum “equivalent
pipe lengths.”
Note: One 90° elbow or two 45° elbows are the
equivalent of 5' of pipe.
Inlet Pipe Specifications
Table 1
2.
Outside air may also be brought to the furnace by
means of a well ventilated attic as shown in Figure 15
on page 12, using 2" or 3" plastic (PVC) drain pipe,
schedule 40 PVC, ABS, single wall galvanized, or
single wall stainless steel pipe (see Table 1). It is
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