QHT Boiler - Manual (Page 5)

5
The Exhaust Hood should be installed on the leeward side of the house and conform to the
following guidelines:
1. The vent hood shall not be less than 3 feet above any forced air inlet to the house.
2. The vent hood shall not be less than 1 foot below, 1 foot horizontally, or 1 foot above any door,
window or gravity inlet into any building.
3. The vent hood shall not be less than 2 feet from an adjacent building.
4. The vent hood shall be not less than 7 feet above grade when located adjacent to a public
walkway.
5. The vent hood shall be located so that flue gasses are not directed to jeopardize people,
overheat combustible structures, materials or enter buildings.
6. Minimum of 4’ horizontal clearance from electric meters, gas meters, regulators and relief
equipment.
7. Care should be taken to ensure the rubber gaskets in ALL vent joints are properly
assembled to prevent leakage of products of combustion in the building.
8. Avoid installing exhaust the hood on the North, West, or the side of the house receiving the
prevailing winds.
Exterior Vent Clearances