Termination
The direct vent cap MUST be mounted on the ex-teri-
or of the building. The direct vent cap cannot be
installed in a well or below grade. The direct vent cap
must be installed at least 1 ft above ground level and
above normal snow levels. The Raypak-approved
stainless steel direct vent cap must be used. The vent
terminal must be located NO CLOSER than 12” off the
wall.
Direct Vent—Vertical
Installation
These installations utilize the heater-mounted blower
to draw combustion air from outdoors and force the
heated flue products through the vent pipe under posi-
tive pressure. The vent material must be in accor-
dance with the above instructions for vent materials.
Vent material must be listed by a nationally recognized
test agency.
The connection from the appliance flue to the stack
must be as direct as possible and should be the same
size or larger than the vent outlet.
WARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
Direct Vent - Vertical
See page 17 for Category I venting guidelines.
It is recommended that the intake vent be insulated in
colder climates.
Termination
The flue terminal should be vertical and should termi-
nate outside the building at least 2 ft above the high-
est point of the roof within 10 ft. The vent cap should
have a minimum clearance of 4 ft horizontally from and
in no case above or below (unless a 4 ft horizontal dis-
tance is maintained) electric meters, gas meters, reg-
ulators and relief equipment. The distance of the vent
terminal from adjacent public walkways, adjacent
buildings, open windows and building openings must
be consistent with the NFGC (U.S.) or B149 (Canada).
Vent pipes supported only by flashing and extended
above the roof more than 5 ft should be securely
guyed or braced to withstand snow and wind loads.
The air inlet opening MUST be installed 1 ft above the
roof line or above normal snow levels that might ob-
struct combustion air flow. This dimension is critical to
the correct operation of the heater and venting system
and reduces the chance of blockage from snow. The
vent cap must have a minimum 3 ft vertical clearance
from the air inlet opening.
WARNING: No substitutions of vent pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
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