John Wood Commercial Power Vent - AJWSM - Manuel (Page 4)

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1. Conduct a gas leakage test of the appliance piping and control system downstream of the shutoff valve in the supply line to the
appliance.
2. Visually inspect the venting system and determine there is no blockage or restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
3. Shut off all gas to the appliance(s).
4. Inspect burners and crossovers for blockage and corrosion.
5. Applicable only to furnaces: Inspect heat exchanger for cracks, openings or excessive corrosion. Check both the limit control and
fan control for proper operation.
6. Applicable only to boilers: Inspect for evidence of water or combustion product leaks. Determine that the water pumps are in
operating condition. Test low water cutoffs, automatic feed controls, pressure and temperature limit controls and relief valves in
accordance with the manufacturer's recommendations to determine that they are in operating order.
* Excerpts from the “National Fuel Gas Code, ANSI Z223.1 (NFPA 54)”, Appendix H.
If possible, locate the Vent Hood on a wall that does not face the direction of prevailing winds. This will diminish the possibility of
appliance interruption during periods of extreme winds.
If possible, locate the Vent Hood no closer than 3 feet from an inside corner of an L-shaped structure.
CODE REQUIREMENTS
Terminate the vent system so that proper minimum clearances are maintained as cited in the latest edition of the “Natural Gas and
Propane Installation Code CAN/CSA-B149.1” or the “National Fuel Gas Code, ANSI Z223.1 (NFPA 54)” and the latest edition of
“Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, (NFPA 211)” as follows:
• Not be less than 7 feet above grade when located adjacent to public walk ways.
• At least 3 feet above any forced air inlet located within 10 feet.
• At least 4 feet below, 4 feet horizontally from or 1 foot above any door, window or gravity air inlet into any building.
• At least 12 inches above grade.
• So that the flue gases are not directed so as to jeopardize people, overheat combustible structures or enter buildings, and
• Not less than 2 feet from an adjacent building.
VENT HOOD LOCATION
VENT HOOD MUST BE MOUNTED
ONE FOOT MINIMUM ABOVE DOORS
AND WINDOWS
VENT
HOOD
VENT HOOD MUST BE
MOUNTED FOUR FEET
MINIMUM AWAY FROM
DOORS AND WINDOWS
VENT HOOD MUST BE MOUNTED
FOUR FEET MINIMUM BELOW
WINDOWS