20
VENTING
PART 5: VENTING, COMBUSTION AIR & CONDENSATE REMOVAL
(CONTINUED)
B. GENERAL
1. Install the water heater venting system in accordance with these instructions and with the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, CAN/CGA B149, and/or applicable provisions of local
building codes.
2. This water heater is a direct vent appliance and is listed as a Category IV appliance with
Underwriters Laboratories, Inc. VENT AND INTAKE AIR VENT
C. APPROVED MATERIALS FOR EXHAUST VENT AND INTAKE AIR VENT
1. Use only Non Foam Core venting material. The following materials are approved for use as vent
pipe for this water heater:
a. Non Foam Core PVC (Polyvinyl Chloride) Pipe conforming to ASTM D-1785.
b. Non Foam Core CPVC (Chlorinated Polyvinyl Chloride) Pipe conforming to ASTM D-1785.
c. Non Foam Core ABS (Acrylonitrile-Butadiene- Styrene) Pipe conforming to ASTM D3965 Class
3-2-2-2-2.
D. EXHAUST VENT AND INTAKE AIR VENT PIPE LOCATION
1. Determine exhaust vent location:
a. The vent piping for this water heater is approved for zero clearance to combustible
construction.
b. See illustration within this section of clearances for location of exit terminals of direct-vent
venting systems.
c. This water heater vent system shall terminate at least 3 feet (0.9 m) above any forced air intake
located within 10 ft (3 m). Note: this does not apply to the combustion air intake of a direct-
vent appliance.
d. Provide a minimum of 1 foot distance from any door, operable window, or gravity intake into
n
WARNING
Both exhaust and intake air vents must exit from the same side of the building to assure
correct appliance operation.
n
WARNING
Do not use Foam Core Pipe in any portion of the exhaust piping from this water heater.
Use of Foam Core Pipe may result in severe personal injury, death, or substantial
property damage.
n
WARNING
This vent system will operate with a positive pressure in the pipe. Do not connect vent
connectors serving appliances vented by natural draft into any portion of mechanical
draft systems operating under positive pressure.
Follow the venting instructions below carefully. Failure to do so may result in severe
personal injury, death, or substantial property damage.
