Venting

This venting section is divided into two parts. Part I will cover venting specifications for 48 Gal - 65,000 BTU (181.7 L - 19.1 kW/Hr), 65 Gal -65,000 BTU (246.1 L - 19.1 kW/Hr), and 75 Gal - 76,000 BTU (283.9 L - 22.3 kW/Hr) models. Part II will cover venting specifications for 40 Gal -40,000 BTU (151.4 L - 11.7 kW/Hr) and 48 gal - 40,000 BTU (181.7 L - 11.7 kW/Hr) models. Refer to the rating plate located on the water heater for correct model identification.

The Nation Fuel Gas Code ANSI Z223.1 -(Latest Edition), CGA/CAN B149 Installation Code, and local codes have specific requirements for the location of the vent terminals on vertical walls. The guidelines listed below are from the National Fuel Gas Code. Consult the local codes, and/or National Fuel Gas Code ANSI Z223.1 -(Latest Edition), or CGA/CAN B149 Installation Code to determine if there are any additions or changes to the following specifications.

(A)The vent terminal must terminate at least 3 feet (.91 m) above any forced air inlet duct located within 10 feet (3 m). Exception: This provision shall not apply to the combustion air intake of a direct vent appliance.

(B)The vent terminal must terminate at least 4 feet (1.2m) below, 4 feet (1.2 m) horizontally from, or 1 foot (.31 m) above any door, window, gravity air inlet into the building.

(C)The bottom of the vent terminal must be located at least 1 foot (.31 m) above ground and above the anticipated snow level.

(D)The vent terminal must not terminate over a public walkway or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valve, or other equipment.

(E)The water heater location must provide easy access for the entire length of the vent connector.

(F)The vent system must be inspected at least once a year to ensure against leakage of exhaust products.

Exceptions For Installations in Canada:

(A)The vent terminal must be located at least 1 foot (.31 m) from any window or door which can be opened in any building, any non-mechanical air supply inlet to any building, or the combustion air to any inlet other appliance.

(B)The vent terminal must be located at least 6 feet (1.8 m) from any mechanical air supply inlet to the building.

(C)The vent terminal must not terminate above a meter/regulator assembly within 3 feet (.91 m) horizontally of the vertical centerline of the regulator and must be at least 6 feet (1.8 m) from any gas service regulator vent outlet.

(D)The vent terminal must be at least 7 feet (2.1 m) above a paved sidewalk or a paved driveway located on public property.