WIR 2 26-06-2003 18:21 Pagina 5

Confined and Unconfined Space

The National Fuel gas Code, ANSI Z223.1/NFPA 54 defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4,8 m3 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 per hour (4,8 m3 per kw) of the aggregate input rating of all apliances installed in that space. Rooms com- municating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

*Adjoining rooms are communicating only if there are doorless passageways or ventilation grilles between them.

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION.

Determining if you have a confined or uncon- fined space.

Use this work sheet 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 grilles between the rooms.

1. Determine the volume of the space (length x width x height).

length x width x height =________ cu.ft.

(volume of space)

Example: space size 20ft. (length) x 16 ft (width) x 8ft (ceiling height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grilles or openings, add the

volume of these rooms to the total volume of the space.

2.Multiply the space volume by 20 to deter- mine the maximum Btu/Hr the space can support.

________ (volume of space) x 20= 51.200

(maximum Btu/Hr the space can support) Example:2560 cu. ft (volume of space) x 20= 51.200 (maximum Btu/Hr the space can support)

3.Add the Btu/Hr of all fuel burning appli- ances in the space.

Vent-free heater ____________ Btu/Hr

Gas water heater* ____________ Btu/Hr

Gas furnace

____________ Btu/Hr

Vented gas heater

____________ Btu/Hr

Gas fireplace logs

____________ Btu/Hr

Other gas appliances* +________Btu/Hr

Total

=___________ Btu/Hr

*Do not include direct-vent gas appliances. Direct- vent draws combustion air from the outdoors and vents to the outdoors.

Example

 

 

Gas water heater*

40,000

Btu/Hr

Vent-free heater

+ 20,000

Btu/Hr

Total

= 60,000

Btu/Hr

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

Btu/Hr (maximum the space can

support)

Btu/Hr (actual amount of Btu/Hr used) Example: 51,200 Btu/Hr (maximum the space

can support)

60,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can sup- port. You must provide additional fresh air.

Your options are as follows:

A.Rework worksheet, adding the space of an adjoining room. If the extra space pro- vides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See ventilation air from inside building, page 4

B.Vent room directly to outdoors. See ventila- tion air from outdoors, page 4

C.Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.

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DeLonghi WIR2 Confined and Unconfined Space, Determining FRESH-AIR Flow for Heater Location, Your options are as follows
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WIR2, WIR1 specifications

The DeLonghi WIR2 and WIR1 are innovative and versatile kitchen appliances designed to elevate the food preparation experience. These models exemplify DeLonghi's commitment to combining technology with user-friendly design, making them ideal for both amateur cooks and culinary enthusiasts.

One of the standout features of the DeLonghi WIR2 and WIR1 is their advanced heating technology. Both models utilize a highly efficient heating system that ensures even temperature distribution. This not only helps in achieving perfect cooking results but also reduces cooking times, making meal preparation more efficient. The rapid heating capability allows users to get started without long waiting periods, ideal for busy households.

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In conclusion, the DeLonghi WIR2 and WIR1 are exemplary choices for those who value efficiency, versatility, and modern design in their kitchen appliances. With their advanced technologies, user-friendly interfaces, and robust safety features, these models are poised to make cooking a more enjoyable and fulfilling experience. Whether you are baking a delicate soufflé or grilling a hearty steak, the DeLonghi WIR2 and WIR1 stand ready to meet your culinary needs with excellence.
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