PAGE 5
VENTILATION & COMBUSTION 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
COMBUSTION AIR REQUIREMENTS
(Minimum Opening Requirements)
*
UNCONFINED AREA
**
CONFINED AREA
Outside
Inside
Outside Combustion Air
Combustion
Combustion
VERT. DUCTS
HORZ. DUCTS
BTU/HR
Air 1 IN.
2
Air 1 IN.
2
1 IN.
2
1 IN.
2
INPUT
/5000 BTU/HR
/1000 BTU/HR
/4000 BTU/HR
/2000 BTU/HR
(Paragraph 4)
(See Fig 1)
(See Fig 2 & 3
(See Fig 4
(MIN. 100 IN
2
)
Pages 5 & 6)
Page 6)
91,000
19
100
23
46
140,000
28
140
35
70
***** 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.
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 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 6. If there is any
doubt, install air supply provisions in accordance with section 5.3, Air for Combustion and
Ventilation, of the latest revision of the NFPA 54 code.
3. When a boiler is installed in an unconfined space, in a building of unusually tight
construction, air for combustion and ventilation must be obtained from outdoors or from
spaces freely communicating with the outdoors. A permanent opening or openings having a
total free area of not less than 1 square inch per 5,000 BTU per hour of total input rating of
all appliances shall be provided. Ducts may be used to convey makeup air from the outdoors
Содержание OSW
Страница 4: ...PAGE 3 FIGURE3...
