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FIGURE 6 - OUTDOOR AIR FOR COMBUSTION,
HORIZONTAL (CASE 4)
IOM
IOM
IMPORTANT:
THE OUTDOOR GRILLS MUST BE INSTALLED IN A LOCATION WHERE THEY WILL NOT BE
OBSTRUCTED IN ANY MANNER.
IMPORTANT:
IF GRILLS ARE USED ON THE OUTSIDE WALL, THEY MUST BE SIZED PROPERLY.
MOST SIDEWALL GRILLS HAVE ONLY 50% FREE AREA. IN THE CASE OF A UNIT WITH
100,000 BTU/HR INPUT, WHICH REQUIRES A PAIR OF 8" (203mm) ROUND PIPES TO
OBTAIN SUFFICIENT COMBUSTION AND VENTILATION AIR, THE DUCT COULD BE AN
EQUIVALENT RECTANGULAR DUCT; 8" X 7" (203mm X 178mm) FOR EXAMPLE. BASED
ON 50% FREE AREA FOR THE INLET GRILLS, THE ACTUAL GRILL SIZE WOULD HAVE
TO BE 14" X 8" (356mm X 203mm) OR ITS EQUIVALENT. A TRANSITION MAY BE USED TO
REDUCE TO THE SMALLER DUCT SIZE IF NECESSARY.
8.1.5 CONNECTION TO FURNACE NON-DIRECT VENT
IMPORTANT:
WHEN USING INDOOR AIR OR THE NON-DIRECT
VENT CONFIGURATION, THE COMBUSTION AIR
INLET TO THE FURNACE MUST BE PROTECTED
FROM BLOCKAGE. USE A DOUBLE ELBOW
ARRANGEMENT IF SUPPLYING COMBUSTION AIR
THROUGH THE TOP, OR A DOWNWARD POINTING
SINGLE ELBOW IF SUPPLYING COMBUSTION AIR
THROUGH THE SIDE. (FIGURE 7)
W415-2306 / C / 09.22.20
Combustion Air
Duct Terminates
12" (305mm)
above floor.
TABLE 3 - HORIZONTAL AIR
SUPPLY (CASE 4)
Input
Free Area
Round Pipe
K/Btu/hr
Ea. Opening
40
30 in
2
(194cm
)
(178mm)
2
60
40 in
2
80
(258cm
2
)
(203mm)
50 in
2
100
(323cm
)
2
60 in
2
120
(387cm
)
(229mm)
2
H13.4C
FIGURE 7 - NON-DIRECT
COMBUSTION AIR INLET
H13.5C
Size
7 in
8 in
9 in
H12.9.7A
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