American Water Heater DIRECT VENT GAS WATER HEATER Installation And Operating Instruction Manual page 12

Venting continued-
I= Clearance to service regulator vent
outlet or oil tank vent
J= Clearance to non-mechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
K= Clearance to a mechanical air supply
inlet
L= Clearance above paved sidewalk or
paved driveway located on public
property
M= Clearance under a veranda, porch,
deck, or balcony
1
In accordance with the current CAN/CGA-B149 Installation Codes.
2
In accordance with the current ANSI Z223.1-(Latest edition)/NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two
single-family dwellings and serves both dwellings.
‡ Permitted only if a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath
the floor.
*a) A minimum clearance value determined by testing in accordance with section 2.20.
*b) "Clearance in accordance with local installation codes and the requirements of the gas supplier".
The vent system must terminate so that proper clearances are maintained as
cited in local codes or the latest edition of the National Fuel Gas Code, ANSI
Z223.1.73.4e and 7.8a, b as follows:
1. Do not terminate near soffit vents or crawl space or other area
where condensate or vapor could create a nuisance or hazard or
cause property damage.
2. Do not terminate the exhaust vent terminal where condensate or
vapor could cause damage or could be detrimental to the operation
of regulators, relief valves, or other equipment.
3. Do not terminate the exhaust vent terminal over public area or
walkways where condensate or vapor can cause nuisance or
hazard.
4. The vent shall terminate a minimum of 12 inches above expected
snowfall level to prevent blockage of vent termination.
Vent pipes serving power vented appliances are classified by building codes
as "vent connectors". Required clearances from combustible materials must
be provided in accordance with information in this manual under LOCATION
OF WATER HEATER and CLEARANCES, and with National Fuel Gas Code
and local code
2
Canadian US Installations
1
Installations
36 inches *b
(91 cm)
12 inches 9 inches
(30 cm) (23 cm)
6 feet 3 feet (91 cm) above if
(1.83 m) within 10 feet
horizontally
7 feet *b
(2.13 m)†
12 inches (30 *b
cm) ‡
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