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6.5.3 Combustion Air
NOTE
Provide adequate combustion air so
as to not create negative pressure
within the building.
• Supply combustion air to the Water Heater as per
the National Fuel Gas Code, ANSI Z223.1 - latest
edition and in Canada, in accordance with the
Natural Gas and Propane Installation Code CSA
B149.1 - latest edition.
• A minimum free area of each opening:
• If the Water Heater is installed in a mechanical
closet, a minimum of permanent clearance of
4 in. or more in front of the Water Heater is
required. In order to facilitate maintenance and
repair, a minimum clearance (24 in. or more)
should be met.
• If combustion air will be provided through a duct,
size the duct to provide 70 ft
3
of fresh air per
minute.
H
H
W
W
Provide two
permanent
openings to allow
circulation of
combustion air.
(e.g. SV Conversion Kit installation)
Indoor make up
air is provided
200 in.²
example 20 in. (W) × 10 in. (H)
Outdoor
make
up air is
provided
Direct or Vertical ducts
50 in.²
example
10 in. (W) × 5 in. (H)
Horizontal ducts
100 in.²
example
20 in. (W) × 5 in. (H)
Venting the Water Heater
Содержание GQ-C3260WXQ-FF PB US
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