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Aerco AM 500W Podręcznik aplikacji

3.5. COMMON VENT PIPING SIZE

Refer to Figures 2, 3, 5, and 6 in Section 2 for typical common vent installations. The maximum
length is the sum of the equivalent straight length of horizontal runs, vertical runs, and fittings of the
individual vent connector and the common vent pipe. The maximum length is the combined length
of straight horizontal and vertical runs, and the equivalent straight length of fittings. The required
diameters for a given AM Series total BTU/hr. input are shown in Tables 11 and 12.
Table 11: Typical Common Combustion Air Run Lengths
Total BTU/hr. Input
(up to and
including)
Common Vent
Diameter
Maximum Vent 
Individual
Connector plus
Common Vent
Equivalent Feet (M)
Table 12: Typical Common Combustion Air Run Lengths
Total
BTU/hr
Common
Input
Vent
(up to and
Diameter
including)
800,000
6"
1,000,000
6"
1,500,000
8"
2,000,000
8"
2,500,000
8"
3,000,000
10"
4,000,000
12"
NOTES:
•
The chart above shows equivalent pipe lengths of the fittings for the common vent pipe. See
section 3.4 for equivalent lengths for fittings for the individual boiler connector.
•
The maximum equivalent length shown is the sum of the equivalent length of the longest individual
connector plus the equivalent length of the common vent pipe. If the maximum equivalent
length exceeds 60 equivalent ft., contact your AERCO sales representative or AERCO
International for design assistance and approval.
•
It is important to use a WYE as a means to connect the individual vent into the common vent pipe.
This will ensure the least amount of pressure drop. Do NOT use a TEE, 90°, or 45° elbow.
PR1 04/08/2014
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
AM Series Venting
Application Guide
800,000
1,000,000
1,500,000
6"
6"
Equivalent Common Vent Lengths Examples
Sharp 90°
Sweep 90°
Elbow
Elbow
Equiv. Ft (m)
Equiv. Ft (m)
10 feet
5 feet
10 feet
n/a
10 feet
n/a
10 feet
n/a
10 feet
n/a
10 feet
n/a
10 feet
n/a
2,000,000
2,500,000
8"
8"
60 feet
WYE or
Termination
45° Elbow
Tee or
Equiv. Ft (m)
Rain Cap
Equiv. Ft (m)
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
5 feet
GF-146
GF-146-V
TAG-0075_0B
TAG-0075_0B
3,000,000
4,000,000
8"
10"
Maximum Length 
Individual Connector
plus Common Vent
Equivalent Ft (m)
60 feet
60 feet
60 feet
60 feet
60 feet
60 feet
60 feet
Page 19 of 20
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