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VII. Venting (continued)
Table 6: Vent and Combustion Air Pipe Diameters and Maximum Lengths
Combustion Air Length
AMP
Pipe Dia.
Model
in. (mm)
8 (200)
1000
6 (160)
8 (200)
1250
6 (160)
8 (200)
1500
6 (160)
2000
8 (200)
2500
10 (250)
3000
10 (250)
3500
12 (315)
4000
12 (315)
NOTE:
Contact factory for assistance on maximum vent length applications.
This table applies to all listed vent/combustion air system options.
Table 7: Equivalent lengths of Vent and Combustion Air Components
Diameter
6 in. (160 mm)
90° Elbow
7 ft. (2.1 m)
45° Elbow
3 ft. (0.9 m)
Table 8: Vent and Combustion Air Equivalent Length Calculation Worksheet
Equivalent
Component
Length Per
Piece
Straight Pipe
90° Elbow
45° Elbow
Notes:
1. Total equivalent length cannot exceed maximum equivalent length shown in Table 6.
2. Combustion air and vent terminations do not count towards total equivalent length.
Minimum
Maximum
ft. (m)
ft. (m)
0
150 (45.7)
0
70 (21.3)
0
150 (45.7)
0
50 (15.2)
0
150 (45.7)
0
50 (15.2)
0
100 (30.5)
0
150 (45.7)
0
150 (45.7)
0
150 (45.7)
0
150 (45.7)
8 in. (200 mm)
11 ft. (3.4 m)
4 ft. (1.2 m)
Combustion Air
x Quantity
=
x
=
x
=
x
=
Combustion Air Total
=
Equivalent Length
Vent Length
Pipe Dia.
Minimum
in. (mm)
ft. (m)
8 (200)
3 (0.9)
6 (160)
3 (0.9)
8 (200)
3 (0.9)
6 (160)
3 (0.9)
8 (200)
3 (0.9)
6 (160)
3 (0.9)
8 (200)
3 (0.9)
10 (250)
3 (0.9)
10 (250)
3 (0.9)
12 (315)
3 (0.9)
12 (315)
3 (0.9)
10 in. (250 mm)
14 ft. (4.3 m)
5 ft. (1.5 m)
Subtotal
Equivalent
Equivalent
Length
Length
Per Piece
A
B
C
Equivalent Length
21
Maximum
ft. (m)
150 (45.7)
70 (21.3)
150 (45.7)
50 (15.2)
150 (45.7)
50 (15.2)
100 (30.5)
150 (45.7)
150 (45.7)
150 (45.7)
150 (45.7)
12 in. (315 mm)
18 ft. (5.5 m)
7 ft. (2.1 m)
Vent
Subtotal
x Quantity
=
Equivalent
Length
x
=
x
=
x
=
Vent Total
=
D
E
F
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