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PAGE 4
COMBCOMB
COMBCOMB
COMB
USTION USTION
USTION USTION
USTION
AIR REQAIR REQ
AIR REQAIR REQ
AIR REQ
UIREMENTSUIREMENTS
UIREMENTSUIREMENTS
UIREMENTS
(MINIMUM SQUARE INCHES OPENING)
**
**
*UNCONFINED AREA
****
****
**CONFINED AREA
OUTSIDE INSIDE OUTSIDE COMBUSTION AIR
MODEL COMBUSTION COMBUSTION VERTICAL HORIZONTAL
NUMBER AIR 1 SQ. IN AIR 1 SQ. IN. DUCTS DUCTS
MGB /5000 BTU/HR /1000 BTU/HR 1 SQ. IN. 1 SQ. IN.
(SEE FIG. 4) (SEE FIG. 3) /4000 BTU/HR /2000 BTU/HR
MGB 38 8 100 10 19
MGB 50 10 100 13 25
MGB 75 15 100 19 38
MGB 100 20 100 25 50
MGB 125 25 125 32 63
MGB 150 30 150 38 75
MGB 175 35 175 44 88
MGB 200 40 200 50 100
MGB 225 45 225 57 113
MGB 275 55 275 69 138
MGB 300 60 300 75 150
VENTILAVENTILA
VENTILAVENTILA
VENTILA
TION & COMBTION & COMB
TION & COMBTION & COMB
TION & COMB
USTION USTION
USTION USTION
USTION
AIRAIR
AIRAIR
AIR
WARNING:WARNING:
WARNING:WARNING:
WARNING: AIR OPENINGS TO COMBUSTION AREA MUST NOT BE
OBSTRUCTED. BY FOLLOWING THE INSTRUCTIONS BELOW, ADEQUATE
COMBUSTION AIR CAN BE MAINTAINED
**
**
* 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).
1. Ventilation of the boiler room must be adequate to provide sufficient air to properly
support combustion per the latest revision of the National Fuel Gas Code, ANSI Z223.1
section 5.3.
2. When a boiler is located in an unconfined space in a building or conventional construction
frame, masonry or metal building, infiltration normally is adequate to provide air for
combustion and ventilation. However, if the equipment is located in a building of unusually tight
construction (See the national Fuel Gas Code, Ansi Z223.1 section 1.7), the boiler area
should be considered as a confined space. In this case air for combustion and ventilation shall
be provided according to part 5 on page 5. If there is any doubt, install air supply provisions
in accordance with the latest revision of the National Fuel Gas Code.
3. When a boiler is installed in an unconfined space, in a building of unusually tight