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20
FIGURE 6 - OUTDOOR AIR FOR COMBUSTION,
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)
9.0 VENTING GUIDELINES
FAILURE TO FOLLOW ALL VENTING GUIDELINES MAY RESULT IN ERRATIC FURNACE
OPERATION, FREEZE-UP OF THE EXHAUST AIR PIPING, OR SOOTING OF THE FURNACE.
W415-1243 / E / 11.27.17
HORIZONTAL (CASE 4)
Combustion Air
Duct Terminates
12" (305mm)
above floor.
CAUTION
!
!
TABLE 3 - HORIZONTAL AIR
SUPPLY (CASE 4)
Input
Free Area
Round Pipe
K/Btu/hr
Ea. Opening
Size
40
30 in
7 in
2
(194cm
2
)
(178mm)
60
40 in
2
80
(258cm
2
)
8 in
(203mm)
50 in
2
100
(323cm
2
)
60 in
2
9 in
120
(387cm
)
(229mm)
2
H12.9.5
H13.4
FIGURE 7 - NON-DIRECT
COMBUSTION AIR INLET
H13.5
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