Installation Guide

• The allowed clearances may differ by the appliance manufacturer. The appliance manufacturer’s

instructions and applicable local codes take precedence over this document.

• Combustible Material is any material made of or surfaced with wood, compressed paper, plant

fibers, or other materials that are capable of being ignited or burned. Such material shall be considered

combustible even though it is flame-proofed, fire-retardant, or plastered. (Source: NFPA54/ANSI

Z223. 1-1999.)

• Non-Combustible Material is any material that is not capable of being ignited and burned, such

material consisting entirely of, or a combination of, steel, iron, brick, tile, concrete, slate, asbestos,

glass, and plaster. (Source: NFPA54/ANSI Z223. 1-1999.)

• For a venting system that extends through any zone above that on which the connected appliance

is located (except for one and two family dwellings), the vent system shall be enclosed with an

enclosure having a fire resistance rating equal to or greater than that of the floor or roof assemblies

through which it passes.

• Design any enclosure to permit inspection of the system.

• Do not place any type of insulation in any required clearance spaces surrounding the vent system.

Clearances to Combustibles: