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MFC Series Boiler Vent and Combustion Air Guide
TABLE 7: Altitude Correction
Site Elevation
(feet above sea level)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
TABLE 8: Round Duct of Identical Pressure Drop to Rectangular Duct
Adjacent
Side of Duct
(in.)
6
6.6
8
7.6
10
8.4
12
9.1
14
9.8
16
10.4
18
11
20
11.5
22
12
24
12.4
Reference:
1. National Fuel Gas Code, 2006 edition, American National Standards Institute, Inc
(ANSI Z223.1-2006) and National Fire Protection Association (NFPA54-2006)
2. CSA B149.1 (For Canada installations)
TAG-0080_OG • GF-148-V •
Altitude Correction Factor
(CF)
0.982
0.964
0.947
0.930
0.913
0.896
0.880
0.864
0.848
0.832
0.817
0.801
0.787
0.772
0.758
0.743
0.729
0.715
0.701
0.688
Side of Rectangular Duct (in.)
6
8
10
12
8.7
9.8
10.9
10.7
12
13.1
11.5
12.9
14.2
12.2
13.7
15.1
12.9
14.5
16
13.5
15.2
16.8
14.1
15.9
17.6
14.6
16.5
18.3
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1
14
16
18
15.3
16.4
17.5
17.3
18.5
19.7
18.2
19.5
20.7
19.1
20.4
21.7
19.9
21.3
22.7
33
20
22
24
21.9
22.9
24
23.9
25.1
26.2
Page 32 of
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