MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
OMM-0087_0F
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
51
of
146
GF-143
Phone: 800-526-0288
07/13/15
Minimum and Maximum Wall Thickness
3.22.2
The label at right, which is placed on the
unit,
indicates the minimum and maximum wall thickness
through which venting is allowed to penetrate
horizontally
. However, if venting is
vertical
, then there
is no minimum wall thickness.
3.23 Vent 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 as follows:
NOTE
The examples referenced in the table below are on the next page.
Table 3-4: Modulex EXT Vent and Piping Diameter Chart
Model
No. of
Modules
Vent Diameter
Inches (mm)
Max. Vent Equiv.
Feet (M)
Examples 1 & 2
Max. Vent Equiv.
Feet (M)
Examples 3 & 4
EXT 321
2
4” (101 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
EXT 481
3
4” (101 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
EXT 641
4
4” (101 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
EXT 802
5
6” (152 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
EXT 962
6
6” (152 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
EXT 1123
7
6” (152 mm)
100 ft. (30 m)
6 + 6 (1.8 + 1.8)
Table 3-5: Modulex EXT Vent and Piping
Length
Chart
Model
Vent
Pipe
Diameter
Sharp 90°
Elbow
Equivalent
Feet (m)
Sweep 90° Elbow
Equivalent
Feet (m)
45° Elbow
Equivalent
Feet (m)
Maximum
Length
Equivalent
Feet (Meters)
EXT 321
4”
(
101
mm)
10 Feet
(3 m)
5 Feet
(1.5 m)
5 Feet
(1.5 m)
100 Feet
(30 m)
EXT 481
EXT 641
EXT 802
6”
(
152
mm)
10 Feet
(3 m)
5 Feet
(1.5 m)
5 Feet
(1.5 m)
100 Feet
(30 m)
EXT 962
EXT 1123
NOTE:
The maximum pressure drop of the combustion air piping is also 100 equivalent feet (30 m).
NOTE
The flue system must be installed in accordance with the local and
national Standards.
