Raypak 122-322 Operating And Installation Instructions page 37

SECTION J-5
Outdoor models are self-venting when installed with the factory-supplied restricted direct vent cap and require no additional
vent piping. This special vent cap is provided with the heater in accordance with CSA requirements. It must be installed
directly on the heater. See Section B for correct clearances.
Care must be taken when locating the outdoor unit because the flue gases discharged from the vent hood can condense as
they leave the hood. Improper location can result in damage to adjacent structures or building finish. For maximum efficiency
and safety, the following precautions must be observed:
a) Outdoor models must be installed outdoors and must use the outdoor vent hood supplied by the manufacturer.
b) Periodically check venting system. The heater's venting areas must never be obstructed in any way and minimum
clearances must be observed to prevent restriction of combustion and ventilation air. Keep area clear and free of
combustible and flammable materials.
c) Do not locate adjacent to any window, door walkway, or gravity air intake. The vent must be located a minimum of
four (4) feet horizontally, or four (4) feet below, or one (1) foot above such areas.
d) Install above grade level and above normal snow levels.
e) Vent terminal must be at least 3 feet above any forced air inlet located within 10 feet.
f) Adjacent brick or masonry surfaces must be protected with a rust-resistant sheet metal plate.
g) Multiple Outdoor Vent installations require a four (4) feet clearance between vent caps.
NOTICE: Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue
condition.
The restricted vent cap must be furnished by the heater manufacturer in accordance with its listing.
An outdoor air filter, supplied by the manufacturer is mounted on the heater.
Outdoor Installation
37