Air For Combustion & Ventilation - Procom SSU220RHN-GB User Manual

AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall not be installed in a confined space or unusually tight construction unless
provisions are provided for adequate combustion and ventilation. 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 54/ANSI Z223.1, Section 5.3, 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 6 through 7 will help you classify your space and provide adequate ventilation.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1 defines a confined space as a space whose volume is less than 50
cubic feet per 1,000 Btu per hour (4.8 m
space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour
(4.8 m per kw) of the aggregate input rating of all appliances installed in that space. Rooms connecting directly
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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 pro-
vided for adequate combustion and ventilation.
* 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. How-
ever, 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 one perm (6×10
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b) Weather stripping has been added on operable windows and 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.
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways
or ventilation grills between the rooms.
1. Determine the volume of the space
Length×Width×Height=
Example: Space size 20ft. (length)×16ft. (width)×8ft. (ceiling height)=2560cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms
to the total volume of the space.
per kw) of the aggregate input rating of all appliances installed in that
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kg per pa-sec-m ) or less with openings gasketed or sealed and
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cu.ft. (volume of space)
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