Appendix S: Temperature Rise Over Gas-fired Furnace
Table S1: VHC-36 Temperature Rise Over Gas-fired Furnace (°F) – 5:1, 2:1 and On/Off Models
Air Volume (CFM)
100 MBH
125 MBH
200 MBH
800
94.1
900
83.6
1,000
75.2
94.1
1,100
68.4
85.5
1,200
62.7
78.4
1,300
57.9
72.3
1,400
53.7
67.2
1,500
50.2
62.7
100.3
1,600
47.0
58.8
94.1
1,700
44.3
55.3
88.5
1,800
41.8
52.3
83.6
1,900
39.6
49.5
79.2
2,000
37.6
47.0
75.2
2,100
35.8
44.8
71.7
2,200
34.2
42.8
68.4
2,300
32.7
40.9
65.4
2,400
31.4
39.2
62.7
2,500
30.1
37.6
60.2
Table S2: VHC-42 Temperature Rise Over Gas-fired Furnace (°F) – 5:1, 2:1 and On/Off Models
Air Volume (CFM)
200 MBH
250 MBH
300 MBH
350 MBH
1,500
1,600
94.1
1,700
88.5
1,800
83.6
1,900
79.2
2,000
75.2
94.1
2,100
71.7
89.6
2,200
68.4
85.5
2,300
65.4
81.8
2,400
62.7
78.4
94.1
2,500
60.2
75.2
90.3
2,600
57.9
72.3
86.8
2,700
55.7
69.7
83.6
2,800
53.7
67.2
80.6
94.1
2,900
51.9
64.9
77.8
90.8
3,000
50.2
62.7
75.2
87.8
3,100
48.5
60.7
72.8
84.9
3,200
47.0
58.8
70.5
82.3
3,300
45.6
57.0
68.4
79.8
3,400
44.3
55.3
68.4
77.5
3,500
43.0
53.7
64.5
75.2
Notes for the above tables:
Use caution in shaded areas.
Values above are calculated at sea level.
Temperature rise = Sea level temperature rise / (1−Elevation (ft.) x 0.0000334)
Gas inlet pressure required for natural gas minimum 5” w.c., maximum 13.5” w.c.; for propane minimum 11” w.c., maximum 13.5” w.c.
High altitude kit required for elevations over 2,000 feet.
VCES-VHC-IOM-1F – VHC-36, -42 & -50
91
