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4
Venting
(continued)
Table 4-2: Vent and Combustion Air Pipe Sizes and Equivalent Lengths
(Applies to All Listed Vent/Combustion Air System Options)
Boiler
Option
Model
Standard
Diameter
APX425C
Reduced
Diameter
Standard
Diameter
APX525C
Reduced
Diameter
Standard
Diameter
APX625C
Reduced
Diameter
Standard
Diameter
APX725C
Reduced
Diameter
Standard
Diameter
APX825C
Reduced
Diameter
Table 4-3: Vent System and Combustion Air System Component Equivalent Length
(Applies to All Listed Vent/Combustion Air System Options)
Component
Nominal Diameter
90° Elbow, Short Radius
90° Elbow, Long Sweep/Sanitary
45° Elbow
Table 4-4: Vent and Combustion Air Equivalent Length Calculation Worksheet
Equivalent
Component
Length Per
Piece
Straight Pipe
90° Elbow,
Short Radius
90° Elbow,
Long Sweep/
Sanitary
45° Elbow
Combustion Air Total
Equivalent Length
Notes:
1. Total equivalent length cannot exceed maximum equivalent length shown in Table 4-2.
2. Use elbow equivalent lengths provided in Table 4-3.
3. Combustion air and vent terminations do not count towards total equivalent length.
4. Pressure drop for flexible polypropylene liner is 20% greater than for rigid pipe. Multiply measured flexible polypropylene liner
length by 1.2 to obtain equivalent length.
Example
Measured length = 35 ft.
Equivalent length =35 ft. x 1.2 = 42 ft.
5. Maximum equivalent length of flexible polypropylene liner is 48 ft. (14.6 m).
16
Combustion Air Length
Pipe Dia., in.
Min., ft.
Max., ft.
(mm)
(m)
4 (100 or 110)
0
100 (30.5)
3 (80)
0
50 (15.2)
4 (100 or 110)
0
100 (30.5)
3 (80)
0
50 (15.2)
4 (100 or 110)
0
100 (30.5)
4 (100 or 110)
0
50 (15.2)
4 (100 or 110)
0
100 (30.5)
4 (100 or 110)
0
50 (15.2)
4 (100 or 110)
0
100 (30.5)
4 (100 or 110)
0
50 (15.2)
3 in. (80 mm)
10 ft. (3.0 m)
4.0 ft. (1.2 m)
3.0 ft. (0.9 m)
Combustion Air
x
Quantity
=
Equivalent Length
x
=
x
=
x
=
x
=
=
APEX
Installation, Operating, & Service Instructions
Vent Length
Pipe Dia., in.
Min., ft.
(m)
(mm)
4 (100 or 110)
2.5 (760)
3 (80)
2.5 (760 )
4 (100 or 110)
2.5 (760)
3 (80)
2.5 (760)
6 (150 or 160)
2.5 (760)
4 (100 or 110)
2.5 (760)
6 (150 or 160)
2.5 (760)
4 (100 or 110)
2.5 (760)
6 (150 or 160)
2.5 (760)
4 (100 or 110)
2.5 (760)
Equivalent Length
4 in. (100 or 110 mm)
13 ft. (4.0 m)
9 ft. (2.7 m)
4.5 ft. (1.4 m)
Equivalent
Subtotal
Length Per
Piece
A
B
C
D
A+B+C+D
Equivalent Length
Approx. Derate at Max.
Max., ft.
(m)
(m)
100 (30.5)
50 (15.2 )
100 (30.5)
50 (15.2 )
200 (30.5)
50 (15.2 )
200 (30.5)
50 (15.2 )
200 (30.5)
50 (15.2 )
6 in. (150 or 160 mm)
22 ft. (6.7 m)
17 ft. (5.2 m)
7.5 ft. (2.3 m)
Vent
Subtotal Equivalent
x
Quantity
=
Vent Total
=
106308-05 - 3/23
Length(%)
5
5
11
12
7
10
11
15
14
15
Length
E
F
G
H
E+F+G+H
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