Maximum Length Air Inlet Pipe
The maximum installed length of the sidewall
or vertical rooftop combustion air inlet pipe
must not exceed 50 equivalent feet (15.2m)
in length. Subtract 5 feet (1.52m) of equivalent
length for each 90° elbow and 2-1/2 feet
(0.7m) of equivalent length for each 45°
elbow installed in the air inlet pipe system.
Air Inlet Pipe Materials
The following air inlet pipe materials are
acceptable:
PVC, CPVC, ABS, Dryer Vent or Sealed
Flexible Duct (not recommended for rooftop air
inlet), galvanized steel vent pipe with joints
and seams sealed and type "B" double-wall
vent with joints and seams sealed.
The air inlet pipe must be sealed. Proper
sealing of the air inlet pipe ensures that
combustion air will be free of contaminants
and supplied in proper volume. When a
sidewall or vertical rooftop combustion air
supply system is disconnected for any reason,
the air inlet pipe must be resealed to ensure
that combustion air will be free of
contaminants and supplied in proper volume.
Sidewall Combustion Air Inlet
The air inlet cap for the sidewall air inlet
option must be purchased from the appliance
manufacturer as per CSA International
requirements. The part numbers for the
required sidewall air inlet cap kit are listed in
TABLE D. Each kit includes the combustion air
inlet cap for installation on an exterior sidewall
for operation of a single appliance only.
Location of a Sidewall Air Inlet Cap
Incorrect installation and/or location of the
air inlet cap may allow the discharge of flue
products to be drawn into the combustion
process of the unit. This may result in
incomplete combustion and potentially
hazardous levels of carbon monoxide in the
flue products. This will cause operational
problems with the unit and may result in
possible spillage of flue products that can
cause personal injury, death or property
damage.
The termination point of the sidewall air inlet
must be located a minimum of 12 inches
(0.30 m) above ground level and above
normal levels of snow accumulation. The
point of termination for the sidewall air inlet
cap must be located a minimum of 3 feet
(0.91m) horizontally and 12 inches (0.30
m) below the point of any flue gas
termination if the air inlet is located within a
10 foot (3.05 m) radius of the flue outlet.
The sidewall air inlet cap must not be
installed above a sidewall flue outlet if it is
located within a 10 foot (3.05m) radius of
the flue outlet.
Lochinvar
12
L o c h i n v a r
D E S I G N E R
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G U I D E
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F I N
W A T E R
H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
(TABLE D) – SIDEWALL AIR INLET KITS
MODEL
AIR
AIR INLET
NUMBER
INLET
CAP
PF0501
5"
SAK3003
PF0751
5"
SAK3003
PF1001
6"
SAK3000
PF1300
6"
SAK3000
PF1500
6"
SAK3000
PF1700
8"
SAK3001
PF2000
8"
SAK3001
