Heat Controller GUH92A - Outdoor Terminations - Horizontal Venting

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3. Secure the coupling with the second hose clamp,
ensuring that the connection is tight and leak free.
Outdoor Terminations - Horizontal Venting
• Vent and combustion air intake terminations shall
be installed as shown in Figure 7 & Figure 8 and in
accordance with these instructions:
• Venttermination clearancesmust beconsistentwith
the NFGC, ANSI 2223.1/NFPA 54 and/or the CSA
B149.1, Natural Gas and Propane Installation Code.
Table 17 (page 45) lists the necessary distances
from the vent termination to windows and building air
intakes.
• Vent and combustion air intake terminations must
be located to ensure proper furnace operation and
conformance to applicable codes. A vent terminal
must be located at least 3 feet above any forced air
inlet located within 10 feet. This does not apply to
the combustion air inlet of a direct vent (two pipe)
appliance. In Canada, CSA B149.1 takes precedence
over these instructions. See Table 17 (page 45).
• Allminimumclearancesmustbemaintainedtoprotect
building materials from degradation by flue gases. See
(Figure 8).
• For optimal performance, vent the furnace through
a wall that experiences the least exposure to winter
winds.
• The vent termination shall be located at least 3 ft.
horizontally from any electric meter, gas meter,
regulator and any relief equipment. These distances
apply ONLY to U.S. installations. In Canada, CSA
B149.1 takes precedence over these instructions.
• Do not installtheventterminal suchthatexhaust is
directed into window wells, stairwells, under decks
or into alcoves or similar recessed areas, and do not
terminate above any public walkways.
• Ifventinghorizontally,asidewallventkitisavailable
according to the pipe diameter size of the installation.
For 2 inch pipe use side wall vent kit #904617, and
for 3 inch pipe use kit #904347.   

• Concentricventterminationkitsareavailableforuse
with these furnaces. For 2 Inch pipe use kit #904952
and or 3 inch pipe use kit # 904953. 

• When the vent pipe must exit an exterior wall close
to the grade or expected snow level where it is not
possible to obtain clearances shown in Figure 7, a
Figure 7. 
12” min. to maximum
expected snow level
(both pipes)
90° Elbow
Exhaust vent
option B
Exhaust vent
option A
Mounting kit faceplate
secured to wall with screws
(both pipes)
Combustion
air inlet
Exhaust vent
option C
18” Min.
36” Max.
8” Min.
36” Max.
(all positions)
Figure 8. Vent Locations
Note 2
Mechanical draft
vent terminal
Direct vent
terminal
50,000 Btuh
or less
Forced air inlet
Direct vent
terminal - more
than 50,000 Btuh
Mechanical
draft vent
terminal
Mechanical
draft vent
terminal
Less
than
10 ft.
3 ft.
NOTES:
1. All dimensions shown are
minimum requirements.
2. Exterior vent terminations must
be located at least 12” above the
maximum expected snow level.
Note 2
4 ft
4 ft
12 in.
12 in.
9 in.
Note 2
Figure 9. 
Support
NOTE: Vent Configuration to Provide
12" Minimum height above Snow Level.
1/2"
Armaflex
Insulation or
Equivalent
(if required)
12" Above
Maximum
Expected
Snow Level
19" Max.
(See Note)
Outside
Wall
Figure 10. 
Combustion Air
Exhaust Vent
12” Above Maximum
Expected Snow Level
(Both pipes)
Elbows on the combustion air
inlet must be positioned pointing
away from the exhaust vent.
8" Min.
36" Max.
Plumbing Vent Roof Boot
(Both Pipes)