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VII. Venting (continued)
C. Field Installation
1. A factory installed 4" PVC slip or 6" cast aluminum
collar provides a means for air intake connection.
2. A factory installed Polypropylene vent adapter
provides a means for vent connection.
3. Vent and combustion air intake pipe must be
supported to allow uniform flow of combustion
air and flue gas.
4. Plan venting system to avoid possible contact
with plumbing or electrical wires. Start at the vent
connector and work towards the vent termination.
Table 6: Vent and Combustion Air Pipe Diameters and Maximum Lengths
Combustion Air Length
AMP
Pipe Dia.
Model
in. (mm)
400
4 (100)
500
4 (100)
650
6 (150)
800
6 (150)
1000L
6 (150)
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
4 in. (100 mm)
90° Elbow
5 ft. (1.5 m)
45° Elbow
2 ft. (0.6 m)
Table 8: Vent and Combustion Air Equivalent Length Calculation Worksheet
Component
Equivalent
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.
AMP 400-1000L I&O Manual
Minimum
Maximum
eq. ft. (m)
eq. ft. (m)
0
100 (30)
0
100 (30)
0
100 (30)
0
100 (30)
0
100 (30)
6 in. (150 mm)
8 ft. (2.4 m)
3 ft. (1 m)
Combustion Air
x Quantity
=
x
=
x
=
x
=
Combustion Air Total
=
Equivalent Length
5. Design the air intake system to allow 3/8" (9.5mm)
of thermal expansion per 10 ft. (3m) of CPVC/
PVC pipe. Runs of 20 ft. (6.1m) or longer that are
restrained at both ends must have an offset.
a. PVC/CPVC combustion air and vent pipe joints
must be cleaned with primer and glued with
cement. Follow all manufacturer instructions and
drawings when preparing pipe ends for joining
and using the primer and the cement.
6. Size and cut wall opening such that a minimal
clearance is obtained and to allow easy insertion
of vent pipe.
Vent Length
Pipe Dia.
Minimum
in. (mm)
eq. ft. (m)
4 (100)
5 (1.5)
4 (100)
5 (1.5)
6 (150)
5 (1.5)
6 (150)
5 (1.5)
6 (150)
5 (1.5)
Subtotal
Equivalent
Equivalent
Length
Length
Per Piece
A
B
C
Equivalent Length
Maximum
eq. ft. (m)
100 (30)
100 (30)
100 (30)
100 (30)
100 (30)
Vent
Subtotal
x Quantity
=
Equivalent
Length
x
=
x
=
x
=
Vent Total
=
D
E
F
17
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