Aerco AM 399W Manual de aplicación - Página 11

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Aerco AM 399W Manual de aplicación

2.3. COMMON COMBUSTION AIR PIPE SIZING

Refer to Figures 6 and 7 for typical common combustion air inlet installation. The maximum length is
the sum of the equivalent straight length of horizontal runs, vertical runs, and fittings of the
individual combustion air connector and the common combustion air pipe. The required diameter
lengths for a given total BTU/hr. Inputs are shown in Tables 6 and 7, below.
Table 6: 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 7: 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"
The chart above shows equivalent pipe lengths of the fittings for the common combustion air pipe.
See section 2.2 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 combustion air pipe.
equivalent length exceeds 60 equivalent feet, 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 combustion air pipe into the common combustion air pipe. This will
ensure the least amount of pressure drop. Do NOT use a TEE, 90°, or 45° elbow.
The maximum pressure drop of the vent is also 60 equivalent feet. Note that this does NOT
mean that the allowed combined pressure drop between the vent and combustion air is 120
equivalent feet. That is, the vent cannot go above 60 equivalent feet, even if the combustion air
is less than 60 equivalent feet, and vice versa.
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
If the maximum
Page 11 of 20
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