Air For Combustion - Through Ceiling - Space-Ray FUSION Series Installation & Operation Instructions

The combustion air inlet should be not less than 3 ft. (0.9m), either vertically or horizontally, from the flue vent
termination. The air intake terminal must be located not less than 1 ft. (30cm) above grade. It is good installation
practice to supply combustion air from the same pressure zone as the vent outlet. Avoid bringing combustion air
to the heater from an attic space. There is no guarantee that adequate combustion air will be supplied.
Flexible Air Intake Hose: Insure that the Air Intake Hose connection is not too tight between the control box and
the Air Intake. The air intake hose can become disconnected as the heater expands and contracts during
operation.
Note: A cold air stopper is not used with fresh air intake through a sidewall.
15.2) AIR FOR COMBUSTION – THROUGH CEILING
If the heater is installed less than 2 ft. from the ceiling, a flexible transition section must be used to allow for
expansion/contraction of straight tube heaters. Install the fresh air intake assembly (supplied in accessory Kit no.
44129500) shown below.
In colder climates, where necessary, insulate the outside combustion air duct. Avoid locating the outside
combustion air duct directly above the control box. Provide a capped cleanout T as necessary.
The Cold Air Stopper (supplied as accessory) is installed into the combustion air inlet duct and is used to prevent
cold air from entering the control unit during periods where the burner and draft inducer are off.
Flexible Air Intake Hose: Insure that the Air Intake Hose connection is not too tight between the control box and
the Air Intake. The air intake hose can become disconnected as the heater expands and contracts during
operation.
All vent terminations and Combustion Air Intake
Terminations must be at least 6" higher than
anticipated snow depth.
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Form 43343100
April 2022 A