Ventilation & Combustion Air - UTICA BOILERS SFM6225W Installation, Operation And Maintenance Manual

AIR OPENINGS TO COMBUSTION AREA MUST NOT BE OBSTRUCTED. FOLLOW THE CHART
BELOW TO OBTAIN AND MAINTAIN ADEQUATE COMBUSTION AIR.
oUtsiDe
comBUstioN air
1 iN /5000BtU
2
(paraGrapH 2)(sQ iN)
BtU/Hr iNpUt
315,000
385,000
420,000
490,000
560,000
630,000
770,000
945,000
1,155,000
1,540,000
1,925,000
2,310,000
2,695,000
3,080,000
* Unconfined area: A space whose volume is not less than 50 cubic feet per 1000 BTU per hour of all appliances in-
stalled 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. When a boiler is located in an unconfined
space in a building of conventional construction
frame, masonry or metal, infiltration normally
is adequate to provide air for combustion and
ventilation. However, in any building which
has been altered to conserve energy or to
minimize infiltration, the boiler area should
be considered as a coNFiNeD space. If
there is any doubt, install air supply provisions
for combustion and ventilation in accordance
with section 5.3, Air for Combustion and Ventila-
VENTILATION & COMBUSTION AIR
comBUstioN air reQUirmeNts
(miNimUm opeNiNG iN sQUare iNcHes)
*
UNcoNFiNeD area
(miN 100iN
63
77
84
98
112
126
154
189
231
308
385
462
539
616
WarNiNG
iNsiDe
comBUstioN air
1 iN /1000 BtU
2
) (FiG 4) (sQ iN)
2
315
385
420
490
560
630
770
945
1155
1540
1925
2310
2695
3080
tion, of the latest revision of the NFPA 54 code,
the recommendations that follow, or applicable
provisions of the local building codes.
2. When a boiler is installed in an unconfined space,
in a building of unusually tight construction, air
for combustion and room 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
9
**
coNFiNeD area
oUtsiDe
comBUstioN air
1 iN /4000 BtU 1 iN
2
(FiG 3)(sQ iN) (FiG 3)(sQ iN)
78.75
96.25
105
123
140
158
193
237
289
385
482
578
675
770
/2000 BtU
2
158
193
210
245
280
315
385
473
578
770
963
1155
1348
1540