Westinghouse WGRTNG199 Nstallation & Maintenance Manual page 17


Ensure the vent is located where it will not be exposed to prevailing winds.

In all roof venting applications, exhaust discharge must point away from the pitch of the roof.

To prevent water leakage, install adequate roof flashing where the pipe enters the roof.

Do not locate vent over public walkways, driveways, or parking lots. Condensate could drip and freeze, resulting in a slip
hazard or damage to vehicles and machinery.

Due to potential moisture build-up, sidewall venting may not be the preferred venting option. To save time and cost, carefully
consider venting installation and location.

Horizontal lengths of exhaust vent must slope back towards the water heater not less than ¼" per foot to allow condensate to
drain from the vent pipe.

The exhaust vent must terminate where vapors cannot make accidental contact with people or pets, or damage shrubs or
plants.

In vacant chimney applications, install and seal a rain cap over existing chimney openings.

All piping must be fully supported. Use pipe hangers at a minimum of 4 foot intervals to prevent sagging of the pipe where
condensate may form.

Do not use the water heater to support any piping.
Figure 5 – Vent Termination Detail
A Clearance above grade, veranda, porch, deck, or balcony
B
Clearance to window or door that may be opened
C Clearance to permanently closed window
Vertical clearance to ventilated soffit located above the
D
terminal within a horizontal distance of 2 feet from the center
E
Clearance to unventilated soffit
F Clearance to outside corner
G Clearance to inside corner
Clearance to each side of center line extended above meter
H
/ regulator assembly
I Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to building or
J
the combustion air inlet to any other appliance
K Clearance to a mechanical air supply inlet
L Clearance above paved sidewalk or driveway located
M Clearance under veranda, porch, deck, or balcony
Table 8 – Vent Termination Clearances - *NOTE: For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA-B 149.1,
please use clearances in accordance with local installation codes and the requirements of the gas supplier.
DESCRIPTION
line of the terminal
US
1 foot
1 foot
*
*
*
*
*
*
*
1 foot
3 feet above if within 10 feet
horizontally
*
*
CANADA
1 foot
3 feet
*
*
*
*
*
3 feet with a height 15 feet
above meter / regulator assembly
3 feet
3 feet
6 feet
7 feet
1 foot
WHL-004 REV. 12.17.14
17