Specifications

12/03/2013 Page 11 of 40
GF-2050
Benchmark Series Boilers
Venting and Combustion Application Guide
TAG-0022_0S
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Figure 5: All Combustion Air from Outdoors Through Horizontal Ducts
1.8 One Permanent Opening Method
One permanent opening shall be provided, commencing within 12 inches (300 mm) of the top of
the enclosure. The appliance shall have clearances of at least 1 inches (25 mm) from the sides
and back of the appliance, and a clearance of 6 inches (150 mm) from the front. The opening
shall communicate with the outdoors directly or through a vertical or horizontal duct to the
outdoors or spaces that freely communicate with the outdoors (as shown in Figure 6) and shall
have a minimum free area as follows:
• 1 inch
2
per 3,000 BTU/hr (700 mm
2
/kW) of the total input rating of all appliances located
in the space.