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Fig. 4: Minimum Clearances from Combustible
Surfaces — Indoor and Outdoor Installations
Table E: Clearances — Outdoor Installations
24”
SERVICE
CLEARANCE
24”
SERVICE
CLEARANCE
24”
SERVICE
CLEARANCE
Combustion and Ventilation Air
Indoor Units
This heater must be supplied with sufficient quantities
of non-contaminated air to support proper combustion
and equipment ventilation. Combustion air can be sup-
plied via conventional means where combustion air is
drawn from the area immediately surrounding the
heater, or via direct vent, where combustion air is
drawn directly from outside. All installations must com-
ply with the requirements of the NFGC (U.S.) and
B149 (Canada), and all local codes.
NOTE: Use of this boiler in construction areas
where fine particulate matter, such as concrete or
dry-wall dust, is present may result in damage to the
boiler that is not covered by the warranty. If operated
in a construction environment, a clean source of
combustion air must be provided directly to the
boiler.
CAUTION: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the boiler and void the warranty. (See
the Appendix.)
NOTE: It is recommended that the intake vent be
insulated in cold climates to minimize sweating.
Venting not shown for clarity. Heater must be vented per
instructions in this manual
Heater
Side
Min. Clearances
from Combustible
S
urfaces
Recommended
Service
C
learances
Rear 24” 24”
Right Side 0” 0”
Left Side 0” 0”
Top Unobstructed 24”
Front Open 24”
Vent
Termination
12” 12”