Innovation Series & ReCon Water Heater
GF-5050
Venting and Combustion Air Guide
TAG-0043_0Q
12/01/2016
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Page
11
of
39
Figure 2: All Combustion Air from Adjacent Indoor Spaces through Indoor Openings
2.3. COMBUSTION AIR FROM OUTSIDE THE BUILDING
Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with the
methods described below. The minimum dimension of air openings shall not be less than 3 inches
(80 mm). The required size of the openings for combustion air shall be based upon the net free area
of each opening. When the free area through a louver, grille, or screen is known, it shall be used to
calculate the opening size required to provide the free area specified. For additional details, consult
NFPA 54, or in Canada, CSA B149.1-10, paragraphs 8.4.1 and 8.4.3.
2.3.1. Two-Permanent-Openings Method (USA Only)
Two permanent openings shall be provided; one commencing within 12 inches (305 mm) of the top of
the enclosure and one commencing within 12 inches (305 mm) of the bottom. The openings shall
communicate directly ― or by ducts ― with the outdoors, or spaces that freely communicate with the
outdoors, as show on the following pages:
1. When communicating directly with the outdoors, or when communicating to the outdoors
through vertical ducts, each opening shall have a minimum free area of 1 inch
2
per
4,000 BTU/hr (654 mm
2
/1.17 kW) of total input rating of all appliances in the space (see
Figures 4 and 5).
OPENING
OPENING
