AIR FOR COMBUSTION AND VENTILATION

Continued

DETERMINING AIR FLOW FOR FIREPLACE LOCATION

Determining if You Have a Confined or Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install fireplace plus any adjoining rooms with doorless passageways or ventilation grills 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 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 cu. 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.

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: 3168 cu. ft. (volume of space) ÷ 50 cu. ft. = 63.3 or 63,300 (maximum Btu/Hr the space can support)

3. Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free fireplace

 

___________________ 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

Example: Gas water heater

 

40,000

Btu/Hr

Vent-free fireplace

+

28,000

Btu/Hr

Total

=

 

 

Btu/Hr

68,000

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

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: 63,300

Btu/Hr (maximum the space can support)

68,000

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 support. You must provide additional fresh air. Your options are as follows:

A.Rework work sheet, 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 8.

B.Vent room directly to the outdoors. See Ventilation Air from Outdoors, page 8.

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

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

Continued

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Desa Tech CGF280NT Determining AIR Flow for Fireplace Location, Determining if You Have a Confined or Unconfined Space
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CGF265NVA, CGF280NT specifications

The Desa Tech CGF280NT and CGF265NVA are innovative heating solutions designed for both efficiency and performance. These models combine advanced technology and user-friendly features, making them suitable for various environments, and particularly effective for residential heating needs.

The CGF280NT model is distinguished by its high-efficiency design, which allows it to deliver substantial heat output while minimizing energy consumption. One of its standout features is the Quiet Operation Technology, which significantly reduces the noise level, ensuring that your living space remains peaceful and comfortable even while the heater is in use. Additionally, it has a powerful fan that enhances heat distribution, allowing for a more consistent and comfortable temperature throughout the area.

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Ultimately, the Desa Tech CGF280NT and CGF265NVA are prime examples of modern heating solutions that prioritize performance, safety, and user convenience. With their advanced technologies and thoughtful design features, they represent a significant advancement in heating technology, ensuring that users enjoy a comfortable and energy-efficient environment all year round.
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