AERCO Innovation (G-10-1350 to G-11-0563) User Manual
Page 160
GF
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5050
TAG-0043_0C
Venting and Combustion Air Guide
Page 160 of 200 AERCO International, Inc.
· 100 Oritani Dr. · Blauvelt, NY 10913 · Ph.: 800-526-0288
07/21/11
4. When calculating free area using louvers and grilles, the required size of the openings for
combustion, ventilation, and dilution air shall be based on the total free area of each opening.
If the free area through a designed louver or grille is known, it shall be used in calculating the
size of opening required to provide the free area specified.
If the louver and grille design free areas are not known, the following will be assumed for
wooden louvers a 25 percent free area, and for metal louvers and grilles a 75 percent free
area opening.
5. When terminating the combustion air through the roof:
a
Combustion air inlet must be 3 ft below any vent outlet within 10 ft. See Figure 4.
b
Combustion air inlet must also face away from the vent outlet. See Figure 4.
6. All inlet air ducts must be sealed air tight.
7. When using sealed combustion, the combustion air inlet and vent outlet must be located on
the same surface (same wall, roof, etc.). See Figures 4 and 5.
This is required so that equal pressure zones are acting on both the air inlet and vent outlet.
This makes the installation a balanced vent system which helps maintain stable combustion
characteristics.
LESS THAN 10 FT
(305 CM)
MORE THAN 10 FT
(305 CM)
10 FT
(305 CM)
NOTE:
NO HEIGHT ABOVE RIDGE REQUIRED FOR
VENT TERMINATION WHEN DISTANCE FROM
RIDGE IS MORE THAN 10 FT (305 CM).
IF DISTANCE FROM RIDGE IS LESS THAN 10 FT
(305 CM), TERMINATION MUST BE A MIN. OF 2
FT ABOVE RIDGE.
RIDGE
3 FT (91 CM)
MINIMUM
3 FT (91 CM)
MINIMUM
2 FT (61 CM) MIN.
Figure 4. Roof-Mounted Combustion Air Inlet & Vent Outlet Installations
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