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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
Minimum and Maximum Wall Thickness
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.
4.25 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 4-4: Modulex EXT Vent and Piping Diameter Chart
MODEL
EXT 321
EXT 481/450
EXT 641/600
EXT 802/800
EXT 962
EXT 1123/1100
TABLE 4-5: Modulex EXT Vent and Piping Length Chart
MODEL
EXT 321
EXT 481/450
EXT 641/600
EXT 802/800
EXT 962
EXT 1123/1100
NOTES:
The maximum pressure drop of the combustion air piping is also 100 equivalent feet (30 m).
The flue system must be installed in accordance with the local and national Standards.
EXAMPLE 1:
OMM-0087_J • GF-143 • 11/17/2020
VENT
NO. OF
DIAMETER
MODULES
INCHES (MM)
4" (101 mm)
2
4" (101 mm)
3
6" (101 mm)
4
6" (152 mm)
5
6" (152 mm)
6
6" (152 mm)
7
SHARP 90°
VENT
ELBOW
PIPE
EQUIVALENT
DIA.
FEET (M)
4"
10 Feet
(101
(3 m)
mm)
6"
10 Feet
(152
(3 m)
mm)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
MAX. VENT EQUIV.
FEET (M)
EXAMPLES 1 & 2
100 ft. (30 m)
100 ft. (30 m)
100 ft. (30 m)
100 ft. (30 m)
100 ft. (30 m)
100 ft. (30 m)
SWEEP 90°
45° ELBOW
ELBOW
EQUIVALENT
EQUIVALENT
FEET (M)
FEET (M)
5 Feet
5 Feet
(1.5 m)
(1.5 m)
5 Feet
5 Feet
(1.5 m)
(1.5 m)
MAX. VENT EQUIV.
FEET (M)
EXAMPLES 3 & 4
6 + 6 (1.8 + 1.8)
6 + 6 (1.8 + 1.8)
6 + 6 (1.8 + 1.8)
6 + 6 (1.8 + 1.8)
6 + 6 (1.8 + 1.8)
6 + 6 (1.8 + 1.8)
MAXIMUM
LENGTH
EQUIVALENT
FEET
(METERS)
100 Feet
(30 m)
100 Feet
(30 m)
Page 55 of 150
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