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from or one (1) foot above any door, window or gravi-
ty inlet to a building. The top surface of the heater shall
be at least three (3) feet above any forced air inlet, or
intake ducts located within ten (10) feet horizontally.
For installations in Canada, pool heaters shall not be
installed with the top of the vent assembly within 10
feet below, or to either side, of any opening into the
building. Refer to the latest revision of CAN/CGA-
B149.
Outdoor Heaters
These heaters are design certified for outdoor installa-
tion, when equipped with the approved top designated
for outdoor use.
High Wind Conditions (Outdoor Units
Only)
In areas where high winds are frequent, it may be nec-
essary to locate the heater a minimum of 3' from high
vertical walls, or install a wind break so the heater is
not in direct wind current.
Heater with
Outdoor Top
Fig. 5: Heater with Outdoor Top
WARNING:
Do not install within 3 feet of a Heat
Pump or an outdoor condensing unit. Strong air
intake from this equipment can disturb the
combustion process and cause damage or personal
injury.
Indoor Heaters
The design is also certified for indoor installation when
equipped with the approved drafthood. For Canada,
indoor installation is restricted to an enclosure that is
not occupied and does not directly communicate with
occupied area. Refer to the latest edition of CAN/ CGA
B-149 for specific requirements.Locate heater as close
as practical to a chimney or gas vent. Heater must
always be vented to the outside. See Vent Piping sec-
tion for venting details. Minimum clearances are
shown on the nameplate.
Combustion Air (Indoor Units
Only)
Air for Combustion and Ventilation
(Indoor Units Only)
The heater must have both combustion and ventilation
air. Minimum requirements for net free air supply
openings are one 12 inches from ceiling for ventilation
and one 12 inches from the floor for combustion air as
outlined in the latest edition of the National Fuel Gas
Code, Z223.1(Canada-CAN/CGA B-149) and any
local codes that may have jurisdiction.
a. All Air from Inside the Building:
Each opening shall have a minimum of 50 net free
square inches.
b. All Air from Outdoors:
When air is supplied directly from outside of the
building, each opening shall have a minimum of 13
net free square inches.
Heater with
Indoor Top
Fig. 6: Heater with Indoor Top
CAUTION:
Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty.