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Venting Installation Tips
Support piping:
· horizontal runs- at least every five (5) feet.
· vertical runs - use braces:
· under or near elbows
Follow items listed below to avoid personal injury or
property damage.
· Cut nonmetallic intake pipe with fine-toothed hack-
saw.
· Do not use nonmetallic intake pipe or fittings that
are cracked or damaged.
· Do not use nonmetallic intake fittings if they are
cut or altered.
· Do not drill holes, or use screws or rivets, in non-
metallic intake pipe or fittings.
To make metallic vent joints:
· Do not install seams of vent pipe on bottom of
runs.
· 100% Seal all joints and seams with high temper-
ature silicone sealant.
Venting Configurations
For heaters connected to gas vents or chimneys, vent
installations shall be in accordance with the section
on, Venting of Equipment, of the latest edition of
NFGC, or in Canada, B149 Installation Code for Gas
Burning Appliances and Equipment, or applicable pro-
visions of local building codes.
WARNING: Examine the venting system at least
once a year. Check all joints and vent pipe
connections for tightness, corrosion or deterioration.
NOTE: The words "Flue Exhaust", "Flue" and
"Exhaust Vent" are used interchangeably.
10 FEET
OR LESS
VENT CAP
2' MIN.
2' MIN.
VENT PIPE
COMBUSTION AIR
FILTER
BOILER
UNIT
Fig. 18: Natural Draft Vertical Venting (Category I)
Model
No.
Appliance
Category
Certified
Venting
Material
Minimum
Recommended
Vent Size (inches)
Min./Max. Venting
Length without
Barometric
Damper (feet)**
122
I
Type B or
Equivalent
4
5/25
162
202
242
5
322 6
**Vent lengths are based on a lateral length of 2 feet. Refer to the latest edition of the NFGC for fur-
ther details. (ANSI Z223.1)
Table J: Natural Draft Vertical Venting