CAL
-SERIES
34
13.0
OUTSIDE COMBUSTION AIR SUPPLY
(Refer to page 35)
The heater must be installed in a location where there is adequate air supply for combustion to take place.
Outside Combustion Air is required for U. S. Residential Garage Heater Installations, and optional for others.
Outside air can either be ducted directly to the burner head or a 4" (10.2 cm) fresh air hood can be installed
in the wall in such a fashion that the outside air can enter the space that the heater is installed in.
In other installations: If the heater is: 1.) Installed in a tightly closed building that has less than one (1 sq
inch (2.54 sq cm) of free opening for each 1,000 b.t.u input of heater or less than 100 square inches of free
opening. Or, 2.) If the building has contaminants in the air or the air is under a slight negative pressure.
Provisions for adequate combustion and ventilation air must be provided. Adequate clearances around air
openings into the combustion chamber must be provided.
NOTE:
Maximum Duct Length for is 25' (7.6
m). This length can have up to 2 - 90° elbows included,
thereafter, deduct 10’ (3 m) for every 90° elbow and 5’ (1.53 m) for every 45° elbow used.
If condensation occurs, insulate duct or contact distributor for alternate methods for your installation. Slope
duct down, away from burner box towards the combustion air intake hood. The combustion air intake hood
must be installed at a height sufficient enough to prevent any blockage by snow.
