Air For Combustion And Ventilation - Procom PCR60M Manual

AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater should not be installed in a confined space or unusually tight construction unless
provisions are provided for adequate combustion and ventilation air. Read the following instructions to insure
proper fresh air for this and other fuel-burning appliances in your home.
Providing Adequate Ventilation
The following are excerpts from National Fuel Gas Code, NFPA 5/ANSI Z.. Air for Combustion and Ventilation. All
spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 7 through 9 will help you classify your space and provide adequate ventilation.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z./NFPA 5 defines a confined space as a space whose volume is less than
50 cu. ft. per 1,000 BTU/hr (4.8 m^3 per kw) of the aggregate input rating of all appliances installed in that space and
an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU/hr (4.8 m^3 per kw) of
the aggregate input rating of all appliances installed in that space. Rooms connecting directly with the space in which
the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined
space.
This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for
adequate combustion and ventilation air.
* Adjoining rooms are connecting only if there are doorless passageways or ventilation grills between them.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for
combustion and ventilation. However, in buildings of unusually tight construction, you
must provide additional fresh air.
Unusually tight construction is defined as construction where:
a) Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of
-11
one perm (6×10 kg per pa-sec-m
b) Weather stripping has been added on openable windows and on doors and
c) Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates
and floors, between wall ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas
lines, and at other openings.
If your home meets all of the three criteria above, you must provide additional fresh air. See "Ventilation Air From
Outdoors". If your home does not meet all of the three criteria above, proceed to "Determining Fresh-Air Flow For
Heater Location".
2
) or less with openings gasketed or sealed and