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VENT PIPE INSTALLATION
NON-DIRECT VENT
INSTALLATION
GUIDELINES
IMPORTANT: Failure to correctly
follow all venting guidelines may
result in erratic furnace operation,
freeze-up of combustion air or
exhaust air piping or sooting of the
furnace.
All exhaust piping must be installed in
compliance with Part 7, "Venting of
Equipment," of the latest edition of the
National Fuel Gas Code NPFA54/
ANSI Z223.1-, local codes or
ordinances and these instructions.
1. Vertical piping is preferred.
2. All horizontal piping must slope
1
upward a minimum of
per foot of run so that
condensate drains toward the
furnace.
3. All horizontal runs must be
supported at least every 4 feet.
No sags or dips are permitted.
4. IMPORTANT: Do not common
vent with any other appliance. Do
not install in the same chase or
chimney with a metal or high
temperature plastic pipe from
another gas or fuel-burning
appliance unless the required
minimum clearances to
combustibles are maintained
between the PVC pipe and other
pipes.
5. All vent runs through
unconditioned spaces where
below-freezing temperatures are
expected should be insulated
with 1-in. thick, medium-density,
foil-faced fiberglass. An
equivalent "arm-a-flex" or
FIGURE 15
TEE TERMINAL – FOR STANDARD
HORIZONTAL SINGLE PIPE
INSTALLATION
VENT
12"
TABLE 1
FOR NON-DIRECT VENT APPLICATIONS - AIR FOR COMBUSTION
PROVIDED FROM INDOORS
MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE PIPE
FURNACE
INPUT
45,000
60,000
⁄
inch
4
75,000
90,000
105,000
NOTES:
1. *N.A. - NOT APPLICABLE.
2. MAXIMUM OF 6 - 90 DEGREE ELBOWS MAY BE USED. DO NOT COUNT ELBOWS REQUIRED FOR
ALTERNATE TERMINATION. USE ONLY MEDIUM OR LONG SWEEP ELBOWS.
3. A 45° DEGREE ELBOW IS CONSIDERED ONE ELBOW.
ELEVATED SINGLE PIPE ALTERNATE TEE TERMINATION
See Figure 16. The tee termination may be elevated up to 24 inches above the
wall penetration if required for anticipated snow levels. Use 2 medium-radius, 2-in.
PVC elbows and 2-in. PVC pipe, attaching the tee so it is 12 inches from the wall.
FIGURE 16
ALTERNATE HORIZONTAL TERMINATION
FOR NON-DIRECT VENT
INSTALLATIONS
NOT APPLICABLE TO
GF951D75
GF951D90
GF951D105
12" MIN. ABOVE
GRADE OR
SNOW LEVEL
PIPE
TERMINATION
SIZE
Standard
2"
Alternate
Standard
2"
Alternate
Standard
3"
Alternate
Standard
3"
GF951U
Alternate
Standard
3"
GF951D
Alternate
Standard
3"
GF951U
Alternate
Standard
3"
GF951D
Alternate
Standard
3"
GF951U
Alternate
Standard
3"
GF951D
Alternate
OUTSIDE
WALL
NUMBERS OF ELBOWS
45° OR 90°
Medium / ong Radius ON Y
1-2
3-4
60
50
50
40
50
40
40
30
60
50
50
40
50
40
40
30
50
40
N/A
N/A
50
50
50
40
50
40
N/A
N/A
60
50
50
40
50
40
N/A
N/A
PIPE
SUPPORT
STRAP
24"
I198
19
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