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!
WARNING
Asphyxiation hazard. Ensure enough air is available
for proper combustion, avoiding hazard due to lack
of oxygen.
MODEL
NUMBER
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
* Unconfined area: A space whose volume is not less than 50 cubic feet per 1000 Btu
per hour of all appliances installed in that space (cubic feet of space = height x width
x length).
** Confined area: A space whose volume is less than 50 cubic feet per 1000 Btu per
hour of all appliances installed in that space (cubic feet of space = height x width x
length).
VENTILATION AND COMBUSTION AIR
COMBUSTION AIR REQUIREMENTS – Chart #3
(MINIMUM SQUARE INCHES OPENING)
*UNCONFINED AREA
OUTSIDE
BOILER
COMBUSTION
MODULES
AIR 1 SQ. IN
/4000 Btu/hr
(SEE FIG. 2)
1
75
1
100
1
125
2
150
2
175
2
200
2
225
2
250
3
275
3
300
3
325
3
350
3
375
!
Air openings to combustion area shall not be
obstructed. Follow Chart 3 to insure adequate
combustion air is maintained.
**CONFINED AREA
OUTSIDE COMBUSTION AIR
INSIDE
COMBUSTION
VERT. DUCTS
AIR 1 SQ. IN.
1 SQ. IN.
/1000 Btu/hr
/4000 Btu/hr
(SEE FIG. 1)
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
8
WARNING
HORZ.
DUCTS
1 SQ. IN.
/2000 Btu/
hr
75
150
100
200
125
250
150
300
175
350
200
400
225
450
250
500
275
550
300
600
325
650
350
700
375
750
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