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Boilers in rooms shall be installed with the clearances from combustible materials not less than
indicated below. Combustible materials are those made of or surfaced with wood, compressed
paper, plant fibers, plastics, or other material that will ignite and burn, whether flame proofed or
not, or whether plastered or not.
The boiler must not be installed on combustible flooring. The boiler is approved for installation on
non combustible flooring only. The boiler must not be installed on carpeting or vinyl flooring.
2. Installation Clearances
Minimum clearances to combustible construction are as follows:
TOP-24 IN. FRONT-12 IN.
FLUE CONNECTOR DOUBLE WALL DIRECT VENT PIPING – 2”
REAR-2 IN. SIDES-2 IN.
Consult NFPA-31 for construction techniques where the above minimum clearances cannot be
obtained. Recommended clearances for servicing can be found in the boiler manual.
The Exhaust Hood must be installed on the leeward side of house and conform to the following guidelines:
1. The Vent hood shall be installed 12” above ground level or 12” above nominal snow level of the
region of the installation, which ever is higher.
2. The Vent hood shall not be less than 3 feet above any forced air inlet to the house.
3. The Vent hood shall not be less than 4 feet below, 4 feet horizontally, or 1 foot above any door,
window or gravity inlet into any building.
4. The Vent hood shall not be less than 3 feet from any obstruction above the hood.
5. The Vent hood shall not be less than 3 feet from any obstructions horizontally in all directions.
6. The Vent hood shall not be less than 2 feet from an adjacent building.
7. The Vent hood shall be not less than 7 feet above grade when located adjacent to public
walkway.
8. The Vent hood shall be located so that flue gasses are not directed to jeopardize people,
overheat combustible structures, materials or enter buildings.
9. Minimum of 4’ horizontal clearance from electric meters, gas meters, regulators and relief
equipment.
10. All joints in system are to be sealed to prevent leakage of products of combustion in the building.
11. Avoid installing exhaust hood on North, West, or prevailing wind side of the house.
