Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-19
Table B2-15. Model 4 fuel, combustion air, and flue gas flow rates
Boiler Size
1500
2000
2500
3000
3500
4000
4500
5000
6000
Fuel Consumpi on
Gas
cfh
1500
1500
2500
3000
3500
4000
4500
5000
6000
Oi l
gph
10.72
14.29
17.86
21.43
25.00
28.57
32.14
35.71
42.85
Combustion Air
Gas
scfh
15,480
20,640
25,800
30,960
36,120
41,280
46,440
51,600
61,920
lb/hr
1207
1609
2012
2414
2817
3219
3621
4024
4828
Oi l
scfh
17,049
22,733
28,414
34,098
39,782
45,463
51,147
56,831
68,196
lb/hr
1269
1692
2115
2538
2961
3384
3808
4231
5077
Flue Gas
Gas
scfh
17,520
23,360
29,200
35,040
40,880
46,720
52,560
58,400
70,080
lb/hr
1,278
1,704
2,130
2,556
2,983
3,409
3,835
4,261
5,113
Oi l
scfh
17,914
23,886
29,855
35,827
41,799
47,769
53,741
59,713
71,655
lb/hr
1,357
1,809
2,261
2,714
3,166
3,618
4,070
4,523
5,427
Notes:
A. Gas consumption, expressed in c ubic feet per hour, is bas ed on 1,000 Btu/cu.ft gas val ue.
B. Oil consumption,expressed in pounds per hour, is based on 140,000 Btu/gal oil value.
C . Oil supply lines must be sized for 125 gph pumping rate. Oi l pump suction press ure to be -10" Hg to 3 psig.
Figure B2-3. Boiler room air supply - “Engineered Design”
GAS
VENT
FRESH AIR OPENING
FRESH AIR OPENING
EXTERIOR WALL
EXTERIOR WALL
