AIR FOR COMBUSTION AND VENTILATION
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| Confined and Unconfined Space | ||||||||
| WARNING: This heater |
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shall not be installed in a confined |
| The National Fuel Gas Code, ANS | ||||||||||||||
space or unusually | tight | con- |
| Z223.1 defines a confined space as a | ||||||||||||
struction unless provisions | are |
| space whose | volume is less than 50 | ||||||||||||
provided for adequate combus- |
| cubic feet | per 1,000 Btu per hour | |||||||||||||
tion and ventilation air. Read the |
| (4.8 m3 per kw) of the aggregate | ||||||||||||||
following instructions | to insure |
| input rating of all appliances installed | |||||||||||||
proper fresh air for this and other |
| in that | space and an unconfining | |||||||||||||
appliances in your |
| space as a space whose volume is | ||||||||||||||
home. |
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| not less than 50 cubic feet | per 1,000 | ||||||||
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| Btu per hour (4.8 m3 | per kw) of | the | ||||||
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| aggregate input rating of all appliances | ||||||||
PROVIDING ADEQUATE | installed |
| in | that | space. | Rooms | ||||||||||
communicating directly with the space | ||||||||||||||||
VENTILATION |
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| in which the appliances are installed*, | |||||||||||||
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| through openings not furnished with | ||||||||
The following | are excerpts from | doors, are | considered a part of the | |||||||||||||
National | Fuel Gas Code, NFPA 54/ | unconfined | space. |
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ANSZ 223.1,Section 5.3, Air for |
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Combustion and | Ventilation. |
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| This heater shall not | be installed in | |||||||||||
All spaces in homes fall into one of | a confined | space | or | unusually | tight | |||||||||||
the | three | following | ventilation | construction | unless | provisions | are | |||||||||
classifications: |
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| provided |
| for | adequate combustion | ||||||||
1. | Unusually Tight Construction | and ventilation air. |
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2. | Unconfined Space |
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3. | Confined Space |
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| * Adjoining rooms are communicating | |||||||||||
The information on pages 5 through 6 | only if there are doorless passage- | |||||||||||||||
will | help | you classify your space and | ways or | ventilation | grills | between | ||||||||||
provide | adequate | ventilation. |
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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 one perm
b)weather stripping has been added on openable 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
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
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space |
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Use this worksheet to determine if you have a confined or unconfined space. |
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Space: Includes | the room in which you will install heater plus any | adjoining rooms with doorless | passageways | ||||||
or ventilation | grills between | the rooms. | × |
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1. Determine | the | volume of | the space (length | width height). |
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× |
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Length Width |
| Height= |
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| cu.ft. (volume of space) |
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| × | × |
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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. |
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2.Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support. (volume of space)÷50 cu. ft.=(Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space)÷50 cu.ft.=51.2 or 51,200(maximum Btu/Hr the space can support)
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