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Heatilator • GBST4336I, GBFL4136I • 2135-900 Rev. D • 11/08
7
7
Vent Information and Diagrams
B. Vent System Confi guration
CAUTION! Risk of Fire! ALL vent confi guration specifi -
cations MUST be followed. This product is tested and listed
to these specifi cations. Appliance performance will suffer if
specifi cations are not followed.
Rise to Run Ratio = 2:1
Maximum Total Horizontal Run = 15 ft.
Minimum Total Vertical Rise for 0-2 Elbows = 12 ft.
Maximum Total Vertical Rise = 50 ft.
Maximum Number of Elbows: Four 90º or six 45º
Minimum Total Vertical Rise for Four 90º or six 45º
Elbows=16 ft.
See Figures 7.1, 7.2, 7.3.
Figure 7.1 Minimum Total Vertical Rise
A. Vent Guidelines
WARNING! Fire Risk/Asphyxiation! This appliance requires
the specifi ed pipe for operation. Incorrect pipe may cause spill-
age, condensation and overheating.
Figure 7.2 Rise to Run Ratio
These models require the following size B-Vent double
wall.
METAL
PLUMBERS' STRAP
MAXIMUM HORIZONTAL RUN IS 50%
OF VERTICAL. HORIZONTAL RUN
CANNOT BE MORE THAN 15 FT
.
VENT SUPPORTS
ARE PER VENT
MANUFACTURER'S
SPECIFICATIONS.
METAL
PLUMBER’S
STRAP
12 FEET
MINIMUM
50 FEET
MAXIMUM
VENT SUPPORTS ARE PER
VENT MANUFACTURER’S
SPECIFICATIONS
MINIMUM CLEARANCES
ARE PER VENT
MANUFACTURER’S
SPECIFICATIONS
• Follow pipe manufacturer’s installation guidelines when
installing the appliance.
WARNING! Fire Risk/Explosion/Asphyxiation! DO NOT
connect this gas appliance to a chimney fl ue serving a
separate solid-fuel or gas burning appliance.
• Vent this appliance directly outside.
• Use separate vent system for this appliance.
May impair safe operation of this appliance or other appli-
ances connected to the fl ue.
WARNING! Risk of Fire or Explosion! Insulation and oth-
er combustibles must not infringe on clearances.
• ALWAYS maintain specifi ed clearances around venting and
fi restop systems.
• Install fi restops as specifi ed.
Failure to keep insulation or other material away from vent pipe
may cause fi re.
Figure 7.3 Proper Use of Elbows
45 DEGREES
ELBOW
90 DEGREES
ELBOW
OFFSETS EXCEEDING
45 DEGREES ADAPT
HORIZONTAL LIMITATIONS
MAXIMUM
HORIZONTAL
15 FEET
MINIMUM
VERTICAL
9 FEET
Note: Maximum horizontal
distance is 50% vertical vent
height.
Models Pipe Size
GBST4336I
5 inches
GBFL4136I
5 inches