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These heaters are design certified for outdoor installa-
tion. Heaters must not be installed under an overhang
of less than three (3) feet from the top on the heater.
Three (3) sides must be open in the area under the
o
verhang. Roof water drainage must be diverted away
from the heaters installed under overhangs with the
use of gutters.
The point from where the flue products exit the heater
must be a minimum of four (4) feet below, four (4) feet
horizontally from or one (1) foot above any door, win-
dow or gravity 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 hor-
izontally.
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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.
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The heater must have both combustion and ventilation
air. Minimum requirements for net free air supply
openings are 12 inches from ceiling for ventilation and
12 inches from the floor for combustion air as outlined
in ANSI Z223.1, and any local codes that may have
jurisdiction.
Fig. 3: Outdoor Clearances from Openings
a. All Air From Inside The Building:
Each opening shall have a minimum net free square
inches as noted:
b. All Air From Outdoors:
When air is supplied directly from outside of building,
each opening shall have a minimum net free square
inches as noted:
%$ Combustion air must not be
c
ontaminated by corrosive chemical fumes which
can damage the heater. Measures must be taken to
prevent the entry of corrosive chemical fumes to the
combustion and ventilation air supply. Such
c
hemicals include, but are not limited to, chlorinated
and/or fluorinated hydrocarbons such as found in
r
efrigerants, aerosol propellants, dry-cleaning fluids,
degreasers, and paint removers. Other harmful
elements may come from bleaches, air fresheners,
or mastics. Vapors from these types of products can
form corrosive acid compounds when burned in a
gas flame. The resulting acidic condensate can
damage or substantially reduce the life of the heater.
It may become necessary to provide outside air
directly to the heater in order to avoid this problem.
Model
Square
Inches
Model
Square
Inches
0133 136 1223 1223
0182/0181 181 1336 1337
0260/0261 264 1468 1467
0330/0331 334 1631 1630
0400/0401 399 1826 1826
0514 512 2100 2100
0624 627 2500 2499
0724 726 3001 3000
0824 825 3500 3500
0962 962 4001 4000
1125 1125
BOLD TYPE indicates Low NOx models.
Model
Square
Inches
Model
Square
Inches
0133 34 1223 306
0182/0181 46 1336 335
0260/0261 66 1468 367
0330/0331 84 1631 408
0400/0401 100 1826 457
0514 128 2100 525
0624 157 2500 625
0724 182 3001 750
0824 207 3500 875
0962 241 4001 1000
1125 282
BOLD TYPE indicates Low NOx models.
Table E: All Air From Inside The Building
Table F: All Air From Outdoors