Use and Care Manual

32
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:
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)
[EZ111DV (GQ-C3260WX-FF US)]
Indoor make up
air is provided
180 in.²
example 20 in. (W) × 9 in. (H)
Outdoor
make
up air is
provided
Direct or Vertical ducts 45 in.²
example 10 in. (W) × 4 1/2 in. (H)
Horizontal ducts 90 in.²
example 20 in. (W) × 4 1/2 in. (H)
[EZ98DV (GQ-C2860WX-FF US)]
• 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 as below.
- EZ111DV (GQ-C3260WX-FF US):
70 ft
3
of fresh air per minute
- EZ98DV (GQ-C2860WX-FF US):
63 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)
Venting the Water Heater