Aerco AM 399B Посібник із застосування - Сторінка 18
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GF-146-V
TAG-0075_0B
3.4. VENT PIPING SIZE
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 as shown on Tables 9
and 10.
Table 9: Required and Maximum Combustion Air Run Lengths
Number of
Modules
Combustion Air
Diameter
Maximum
Combustion Air
Equivalent Feet
(Meters)
Table 10: Maximum Combustion Air Run Lengths
Model No.
Diameter
AM 399
(102 mm)
AM 500
AM 750
(152 mm)
AM 1000
The maximum pressure drop of the combustion air piping is also 60 equivalent feet. See Section
2.2. Note that this does NOT mean 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.
EXAMPLES:
1. A 40 foot length of vent pipe and 1 sharp 90° elbow plus a termination rain cap add up to 40 ft. +
10 ft. + 10 ft. = 60 equivalent ft.
2. A 30 foot length of vent pipe and 2 sharp 90° elbows plus a termination rain add up to 30 ft. + (2 x
10 ft.) + 10 ft. = 50 equivalent ft.
Page 18 of 20
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
AM Series Venting
Application Guide
AM 399
2
4"
Equivalent Pipe Lengths Examples
Pipe
Sharp 90°
Elbow
Equiv. Ft (m)
4"
10 ft.
(3.05 m)
6"
10 ft.
(3.05 m)
AM 500
AM 750
2
3
60 ft.
Sweep 90°
45° Elbow
Elbow
Equiv. Ft (m)
Equiv. Ft (m)
5 ft.
5 ft.
(1.5 m)
(1.5 m)
5 ft.
5 ft.
(1.5 m)
(1.5 m)
AM 1000
4
6"
Maximum
Length
Equivalent
Ft (m)
60 ft.
(30.5 m)
60 ft.
(30.5 m)
AM1 04/08/2014