Aerco AM 399W Manual de aplicação - Página 10
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GF-146-V
TAG-0075_0B
2.2. COMBUSTION AIR PIPE SIZING
The maximum length is the combined length of straight horizontal and vertical runs, and the equivalent
straight length of fittings. The required lengths for each boiler are shown in Tables 4 and 5, below.
Table 4: Required and Maximum Combustion Air Run Lengths
Number of Modules
Combustion Air Diameter
Maximum Combustion Air
Equivalent Feet (Meters)
Model No.
Diameter
AM 399
(102 mm)
AM 500
AM 750
(152 mm)
AM 1000
The maximum pressure drop of the vent is also 60 equivalent feet (30.5 m). See Section 3.4. Note
that this does NOT mean the allowed combined pressure drop between the vent and combustion air
is 120 equivalent feet (61 m). That is, the vent cannot go above 60 equivalent feet (30.5 m), even if
the combustion air is less than 60 equivalent feet, and vice versa.
Examples:
1. Acceptable:.
A 30 foot length of combustion air pipe and 1 sharp 90° elbow plus two termination 90° elbows
add up to 30 ft. + 10 ft. + (2 x 10 ft.) = 60 equivalent ft.
2. NOT Acceptable:
A 30 foot length of combustion air pipe and 2 sharp 90° elbows plus two termination 90°
elbows add up to 30 ft. + (2 x 10 ft.) + (2 x 10 ft.) = 70 equivalent ft. (excessive legth).
Page 10 of 20
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
AM Series Venting
Application Guide
AM 399
2
Table 5: Maximum Combustion Air Run Lengths
Equivalent Pipe Lengths Examples
Sharp 90°
Pipe
Elbow
Equiv. Ft (m)
4"
10 ft.
(3.05 m)
6"
10 ft.
(3.05 m)
AM 500
2
4"
60 ft.
Sweep 90°
45° Elbow
Elbow
Equiv. Ft (m)
Equiv. Ft (m)
5 ft.
(1.5 m)
(1.5 m)
5 ft.
(1.5 m)
(1.5 m)
AM 750
AM 1000
3
4
6"
Maximum
Length
Equivalent
Ft (m)
5 ft.
60 ft.
(30.5 m)
5 ft.
60 ft.
(30.5 m)
AM1 04/08/2014