UTICA BOILERS SFM24150W, Installation, Operation And Maintenance Manual

Page: 9 / 28

9
AIR OPENINGS TO COMBUSTION AREA MUST NOT BE OBSTRUCTED. FOLLOW THE CHART
BELOW TO OBTAIN AND MAINTAIN ADEQUATE COMBUSTION AIR.
WarNiNG
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
**
coNFiNeD area
oUtsiDe
comBUstioN air
iNsiDe
comBUstioN air
oUtsiDe
comBUstioN air
1 iN
2
/5000BtU
(paraGrapH 2)(sQ iN)
1 iN
2
/1000 BtU
(miN 100iN
2
) (FiG 4) (sQ iN)
1 iN
2
/4000 BtU
(FiG 3)(sQ iN)
1 iN
2
/2000 BtU
(FiG 3)(sQ iN)
BtU/Hr iNpUt
315,000 63 315 78.75 158
385,000 77 385 96.25 193
420,000 84 420 105 210
490,000 98 490 123 245
560,000 112 560 140 280
630,000 126 630 158 315
770,000 154 770 193 385
945,000 189 945 237 473
1,155,000 231 1155 289 578
1,540,000 308 1540 385 770
1,925,000 385 1925 482 963
2,310,000 462 2310 578 1155
2,695,000 539 2695 675 1348
3,080,000 616 3080 770 1540
* 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).
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