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COMBUSTION AND VENTILATION AIR (Indoor Units Only)
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Model Square Inches Model Square Inches
Model
Unrestricted Opening (sq. in.)
Typical Screened or
Louvered Opening (sq. in.)
Typical Screened and
Louvered Opening (sq. in.)
Direct Vent
If outside air is drawn through the intake pipe directly to the unit for combustion:
1. Install combustion air direct vent in accordance on page 21 (horizontal) or page 22 (vertical) of this manual.
2. Provide adequate ventilation of the space occupied by the heater(s) by an opening(s) for ventilation air at
the highest practical point communicating with the outdoors. The total cross-sectional area shall be at least
1 in.
2
of free area per 20,000 BTUH (111 mm
2
per kW) of total input rating of all equipment in the room when
the opening is communicating directly with the outdoors or through vertical duct(s). The total cross-section-
al area shall be at least 1 in.
2
of free area per 10,000 BTUH (222 mm
2
per kW) of total input rating of all
equipment in the room when the opening is communicating with the outdoors through horizontal duct(s).
3. In cold climates, and to mitigate potential freeze-up, Raypak highly recommends the installation of a motor-
ized sealed damper to prevent the circulation of cold air through the heater during the non-operating hours.
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