Thermo Pride Thermo Pace Downflow/Horizontal Furnace Installer's Information Manual page 12

Table 1. Maximum Pipe Length--Direct Vent
ALTITUDE FURNACE
INPUT
54,000
72,000
72,000
0'-1000' 90,000
90,000
108,000
126,000
54,000
72,000
72,000
1001'-2000' 90,000
90,000
108,000
126,000
54,000
72,000
72,000
2001'-3000' 90,000
90,000
108,000
126,000
54,000
72,000
72,000
3001'-4000' 90,000
90,000
108,000
126,000
126,000
54,000
72,000
72,000
4001'-5000' 90,000
108,000
108,000
126,000
54,000
72,000
72,000
5001'-6000' 90,000
108,000
108,000
126,000
54,000
72,000
72,000
6001'-7000' 90,000
108,000
126,000
54,000
72,000
72,000
7001'-8000' 90,000
108,000
126,000
54,000
72,000
72,000
8001'-9000' 90,000
108,000
126,000
54,000
72,000
72,000
9001'-10000' 90,000
108,000
126,000
NOTE 1: The table assumes the use of sweep elbows. If using hard 90? elbows, the vent length should be decreased
anadditional 3 feet for every elbow used.
NOTE 2: The shaded portions of the table require the high altitude pressure switch in order to operate the furnace at the
listed vent lengths.
Page 12
ALLOWABLE PIPE LENGTH (feet of each pipe)
PIPE NUMBER OF SWEEP ELBOWS (each pipe)
DIA. 1 2
2" 40 40
2" 40 40
3" 40 40
2" 30 26
3" 40 40
3" 40 40
3" 40 40
2" 40 40
2" 40 37
3" 40 40
2" 25 22
3" 40 40
3" 40 40
3" 40 38
2" 40 40
2" 35 33
3" 40 40
2" 22 19
3" 40 40
3" 40 40
3" 35 30
2" 40 40
2" 30 28
3" 40 40
2" 15 13
3" 40 40
3" 40 40
3" 30 25
3" 40 40
2" 40 40
2" 26 22
3" 40 40
3" 40 40
3" 40 40
3" 40 40
3" 40 40
2" 40 40
2" 21 18
3" 40 40
3" 40 40
3" 40 35
3" 40 40
3" 40 40
2" 40 40
2" 40 40
3" 40 40
3" 40 40
3" 40 40
3" 40 40
2" 40 40
2" 40 40
3" 40 40
3" 40 40
3" 40 40
3" 40 40
2" 40 40
2" 40 40
3" 40 40
3" 40 40
3" 40 40
3" 40 40
2" 40 40
2" 40 37
3" 40 40
3" 40 40
3" 40 40
3" 40 35
3 4 5
40 40 40
37 33 30
40 40 40
22 19 15
40 40 40
40 40 40
40 40 35
40 40 40
33 29 25
40 40 40
19 16 12
40 40 40
40 40 40
33 28 22
40 40 40
29 25 21
40 40 40
16 14 -
40 40 40
40 40 40
25 20 15
40 40 40
26 24 22
40 40 40
11 - -
40 40 40
40 40 40
20 15 10
40 40 35
40 40 40
17 14 12
40 40 40
40 40 40
40 35 30
40 40 40
40 40 35
40 40 40
14 11 -
40 40 40
40 40 40
30 25 20
40 40 40
40 40 35
40 40 40
40 40 36
40 40 40
40 40 40
40 40 40
40 40 35
40 40 40
40 37 35
40 40 40
40 40 40
40 40 40
40 40 35
40 40 40
37 34 31
40 40 40
40 40 40
40 40 40
40 35 30
40 40 40
35 31 27
40 40 40
40 40 40
40 40 40
30 25 20
(SEE NOTE 1)
6 7 8
40 40 40
27 23 20
40 40 40
11 - -
40 40 40
40 40 40
30 25 20
40 40 40
21 19 15
40 40 40
- - -
40 40 40
40 40 40
16 11 -
40 40 40
17 13 -
40 40 40
- - -
40 40 40
40 40 40
10 - -
40 40 40
20 18 17
40 40 40
- - -
40 40 40
40 40 40
- - -
30 25 20 See Note 2
40 40 40
- - -
40 40 40
40 40 40
25 20 15
40 40 40 See Note 2
30 25 20
40 40 40
- - -
40 40 40
40 40 40
15 10 -
40 40 40 See Note 2
30 25 20
40 40 40
32 28 24
40 40 40
40 40 40 See Note 2
40 40 40
30 25 20
40 40 40
32 28 24
40 40 40
40 40 40 See Note 2
40 40 40
30 25 20
40 40 40
28 24 21
40 40 40
40 40 40 See Note 2
40 40 40
25 20 15
40 40 40
24 21 18
40 40 40
40 40 40 See Note 2
40 40 40
15 - -
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