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Combustion Air and Ventilation
When determining the installation location for a power
vent water heater, snow accumulation and drifting should
be considered in areas where applicable.
Venting Through an Outside Wall – Clearances
•
0″ clearance for 3″ (or optional 2″ and 4″) PVC, ABS, or CPVC
Schedule 40 piping from combustible surfaces.
•
18″ minimum in all directions from any obstruction that may
interfere.
•
12″ minimum from the ground, 9″ ceiling overhangs. Figure 2.
•
The Power Vent outlet terminal shall terminate at least 36″
above any forced air inlet into the building located within 10
feet. Figure 3a.
•
The Power Vent outlet terminal shall terminate at least 4 feet
below, 4 feet horizontally from or 1 foot above any door, win-
dow or gravity air inlet into the building. Figure 3a.
•
18″ minimum from other natural draft (gravity) direct vent,
power vent or power direct vent appliance inlet and/or outlet
vent(s) when directly above or 135° to either side of center line.
Figure 3c.
•
24″ minimum from any appliance inlet and/or outlet vents
when directly below or 45° to either side of center line. Figure
3c.
•
The location selection must provide clearances for servicing and
proper operation of the water heater. Figure 4.
•
Vent termination must not be within 4 feet of any items such
as gas meters, gas valves or other gas regulating equipment.
•
The venting system must be installed in a manner which allows
inspection of the installation of the venting pipes and joints as
well as periodic inspection after installation as required by ANSI
Standards.
VENTILATION
AIR
OPENINGS
100 Sq In
Minimum
100 Sq In
Minimum
RECTANGULAR AIR
DUCT
TOP VIEW
OF CLOSET
WITHOUT DOOR
TOP VIEW
OF CLOSET
WITH DOOR
FRONT VIEW
OF DOOR
AIR DUCT
DOOR
12" MAX.
12" MAX.
0"
MIN.
0"
MIN.
5"
MIN.
0" MIN.
0" MIN.
3" MIN.
6" MIN.
6" MIN.
DOOR
WATER
HEATER
WATER
HEATER
Figure 1
WARNING
Minimum clearances between the water heater and com-
bustible and non-combustible construction are: 0 inches
from sides, 0 inches from back, 5 inches from front of jack-
et to closet door and 14 inches from top of jacket to com-
bustible and non-combustible material. Minimum vent clear-
ance: 0 inches. Provide 24 inches front clearance for ser-
vicing and adequate clearance between the jacket top &
ceiling for servicing the flue area. (See Figure 1).
WARNING
Vent termination must not be within 4 feet of any items such as
gas meters, gas valves or other gas regulating equipment.
WARNING
Failure to have required clearances between water heater
and combustible material will result in a fire hazard.
WARNING
A gas water heater cannot operate properly without the
correct amount of air for combustion. Do not install in a
confined area such a closet, unless you provide air as
shown in the “Locating The New Water Heater” section.
Never obstruct the flow of ventilation air. If you have
any doubts or questions at all, call your gas company.
Failure to provide the proper amount of combustion air
can result in a fire or explosion and can cause DEATH,
SERIOUS BODILY INJURY, OR PROPERTY DAMAGE.
WARNING
If this water heater will be used in beauty shops, barber
shops, cleaning establishments, or self-service laundries
with dry cleaning equipment, it is imperative that the
water heater or water heaters be installed so that com-
bustion and ventilation air be taken from outside these
areas. Refer to the “Locating The New Water Heater”
section of this manual and also the current edition of
the National Fuel Gas Code, ANSI Z223.1, also referred
to as NFPA 54 for specifics provided concerning air
required.
TOP VIEW OF
ALCOVE
WARNING
This water heater must not be installed directly on carpeting.
Carpeting must be protected by a metal or wood panel
beneath the appliance extending beyond the full width and
depth of the appliance by at least 3 inches (76.2mm) in any
direction, or if the appliance is installed in an alcove or clos-
et, the entire floor must be covered by the panel. Failure to
heed this warning may result in a fire hazard.
WARNING
Propellants of aerosol sprays and volatile compounds,
(cleaners, chlorine based chemicals, refrigerants, etc.) in
addition to being highly flammable in many cases, will also
change to corrosive hydrochloric acid when exposed to the
combustion products of the water heater. The results can
be hazardous, and also cause product failure.
Locating the New Water Heater (cont’d)
Facts to Consider About the
Location (cont’d)
8