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Measures must be taken to prevent the entry of corrosive chemical fumes to the combustion and ventilation
air supply. Such chemicals include, but are not limited to, chlorinated and/or fluorinated hydrocarbons such as
found in refrigerants, aerosol propellants, dry-cleaning fluids, degreasers, and paint removers. Other harmful
elements may come from bleaches, air fresheners, or mastics. Vapors from these types of products can form
corrosive acid compounds when burned in a gas flame. The resulting acid condensate can damage or
substantially reduce the life of the heater. It may be necessary to provide outside air directly to the heater in order
to avoid this problem.
An adequate supply of air for proper combustion and ventilation must be provided in accordance with Sec.
5.3 of the National Fuel Gas Code, ANSI Z223.1. or applicable provisions of the local building codes.
Do not obstruct the flow of combustion and ventilation air to the heater.
VENTING
The vent pipe must be the same size or larger than the 4" diameter outlet on the heater. The standard vent
outlet is on the right side, but this can be changed to the left side by reversing the orientation of the flue collector
box. This can be done easily in the field. Remove the top casing cover to gain access to the flue collector box.
Remove the screws along the sides of the flue collector. Disconnect the vent switch tubing from the fitting and
remove the fitting from the flue collector box. Lift the box and turn around the other direction. Remove the
stainless steel plug button and install the fitting in its place; then install the plug button where the fitting was
removed. Reconnect the vent switch tubing to the fitting. Replace and secure the flue collector box with the
screws previously removed.
The maximum flue gas temperature at the heater outlet is less than 400 degrees F. Use only the special gas
vents listed for use with Category III gas burning heaters, such as the stainless steel Saf-T Vent manufactured
by Heat-Fab, Inc. (800-772-0739), or the StaR-34 stainless steel gas vents manufactured by Flex-L International,
Inc. (800-561-1980), of the FasNSeal stainless steel gas vents manufactured by ProTech Systems, Inc. (800-
766-3473). A special adapter may be required. Pipe joints must be positively sealed. Follow carefully the vent
manufacturers' installation instructions.
WARNING: Provide a screen or barrier to prevent personal injury in areas where personnel contact with vent pipe
can occur; but DO NOT INSULATE the vent pipe, nor use means that will restrict thermal expansion or movement
of the vent.
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