Installation Guide

Polypropylene (PP) Common Venting Installation Instructions 20

Combuson Air Requirements

Common Vent Applicaons Ulizing Room Air

Common Vent Room Air

Appliance Adapter

Combustion Air Requirements

This rack system requires adequate combuson air for venlaon and diluon of ue gases. Failure to provide

adequate combuson air can result in unit failure, re, explosion, serious bodily injury or death. Use the

following methods to ensure adequate combuson air is available for correct and safe operaon of this rack

system.

Important: Combuson air must be free of corrosive chemicals. Do not provide combuson air from

corrosive environments. System failure due to corrosive air is not covered by warranty.

Combuson air must be free of acid forming chemical such as sulfur, uorine and chlorine. These chemicals

have been found to cause rapid damage and decay and can become toxic when used as combuson air in gas

appliances. Such chemicals can be found in, but not limited to bleach, ammonia, cat lier, aerosol sprays,

cleaning solvents, varnish, paint and air fresheners. Do not store these products or similar products in the

vicinity of the water heater system.

Unconned Space:

An unconned space is dened in

Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54

as “a space whose volume is

not less than 50 cubic feet per 1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input rang of all appli-

ances installed in that space. Rooms communicang directly with the space in which the appliances are in-

stalled, through openings not furnished with doors, are considered a part of the unconned space.” If the

“unconned space” containing the system is in a building with ght construcon, addional outside air may

be required for proper operaon. Outside air openings should be sized the same as for a conned space.

Conned Space:

(Small Room, Closet, Alcove, Ulity Room, Etc.)

A conned space is dened in the

Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54

as "a space whose volume is

less than 50 cubic feet per 1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input rang of the

combined appliances installed in that space." A conned space must have two combuson air openings. Size

the combuson air openings based on the BTU input for all gas ulizaon equipment in the space and the

method by which combuson air is supplied.