Modulex EXT Vent and Combustion Air Application Guide
Page 12 of
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AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
TAG-0054-0F
09/25/2017
Phone: 800-526-0288
GF-136-V
Figure 8: Outdoor Installation Air Inlet and Vent Outlet Locations
11. For outdoor installations, an outdoor venting kit is available through AERCO. Please contact your
local representative for further details.
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 Table 3, below.
TABLE 3: Maximum Combustion Air Run Lengths
MODEL NO.
PIPE
DIAM.
EQUIVALENT PIPE LENGTHS EXAMPLES
MAXIMUM
LENGTH
EQUIVALENT
FT (M)
Sharp 90°
Elbow
Equiv. Ft (m)
Sweep 90°
Elbow
Equiv. Ft (m)
45° Elbow
Equiv. Ft (m)
EXT 321
EXT 481/450
EXT 641/600
4”
(102
mm)
10 ft.
(3.05 m)
5 ft.
(1.5 m)
5 ft.
(1.5 m)
100 ft.
(30.5 m)
EXT 802/800
EXT 962
EXT 1123/1100
6”
(152
mm)
10 ft.
(3.05 m)
N/A
5 ft.
(1.5 m)
100 ft.
(30.5 m)
EXT 1530/1500
EXT 1912
10”
(254
mm)
10 ft.
(3.05 m)
N/A
5 ft.
(1.5 m)
100 ft.
(30.5 m)
EXT 2295/2300
EXT 2677/2600
EXT 3060/3000
12”
(305
mm)
10 ft.
(3.05 m)
N/A
5 ft.
(1.5 m)
100 ft.
(30.5 m)
The maximum pressure drop of the vent is also 100 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
200 equivalent feet (61 m). That is, the vent cannot go above 100 equivalent feet (30.5 m), even if the
combustion air is less than 100 equivalent feet, and vice versa.
Bird Screen
Installed