Determining Size Of Pipe To Install
To determine what diameter pipe to use in an installation (3” or 4”), first find the “equivalent pipe length” using the following guidelines, then plot this number and the altitude on the chart (Figure 13).
Fill out the installation chart, and calculate your total equivalent pipe length. After you have the total equivalent pipe length, use the Pipe Selection Chart below to determine if your installation requires 3” or 4” exhaust pipe.
Installation Chart
Type of Pipe | # of Elbows or |
| Equivalent Feet | Total Equivalent |
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90° Elbows/ |
| x | 5 Feet (1.5 m) |
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Tee (A & G) |
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45° Elbows |
| x | 3 Feet (1 m) |
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(C) |
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Horizontal |
| x | 1 Feet (.3 m) |
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(B & F) |
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Vertical (E) |
| x | .5 Feet (.15 m) |
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Table 3 |
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Sample Installation Chart |
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Type of Pipe | # of Elbows or |
| Equivalent Feet | Total Equivalent |
| Feet of pipe |
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90° Elbows/ | 2 | x | 5 Feet (1.5 m) | 10 (3 m) |
Tee (A & G) |
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45° Elbows | 1 | x | 3 Feet (1 m) | 3 (1 m) |
(C) |
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Horizontal | 3 | x | 1 Feet (.3 m) | 3 (1 m) |
(B & F) |
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Vertical (E) | 8 | x | .5 Feet (.15 m) | 4 (1.2 m) |
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Table 4 - Sample Chart for Figure 14 |
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| 30 |
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(Feet) |
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| 4 “ Diameter Only |
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20 |
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Length |
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| 3 or 4” |
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Pipe |
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10 |
| Diameter |
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Equivalent |
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0 |
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| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Altitude x 1000 Feet
Figure 13 - Pipe Selection Chart
NOTE: All equivalent pipe styles shown for model Montage 32FS.
| B |
A - 90 Degree Elbow | A |
B - 1’ Horizontal Pipe | |
C - 45 Degree Elbow | C |
D - Standoff Braces |
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E - 8’ Vertical Pipe |
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F - 2’ Horizontal Pipe | D |
G - 90 Degree Tee | |
H - Wall Thimble | E |
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F
G
H
Figure 14 - See Sample Installation Chart
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
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