OWNER'S MANUAL

AIR FOR

COMBUSTION AND

VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR FIREPLACE 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 firebox 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

firebox

Btu/Hr

 

 

 

 

Gas water

heater*

Btu/Hr

Example:

 

 

Gas furnace

Btu/Hr

Gas water

heater

40,000

Btu/Hr

Vented

gas heater

Btu/Hr

Vent-free

firebox with log heater +

39,000

Btu/Hr

Gas firebox logs

Btu/Hr

Total

 

79,000

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.

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

Btu/l-lr (maximum the space can support)

Btu/Hr (actual amount of Btu/Hr used)

Example: 63,300 Btu/Hr (maximum the space can support) 79,000 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. Yon must provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin- ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.

C.Install a lower Btu/Hr fireplace, if lower Btu/I-Ir 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.

I

_lb WARNING: If the area In which the firebox end gas log heater may be operated is smeller than that defined as I an unconfined space or If the building Is of unusually tight construction, provide adequate combustion and I ventilation air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3 or eppllceble local codes.

f_

5

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Desa Tech CGFB32C, CGFB32NC Combustion Ventilation, Determining FRESH-AIR Flow for Fireplace Location, Btu/Hr
Page 4 Page 6

CGFB32C, CGFB32NC specifications

Desa Tech has established a reputation for delivering innovative heating solutions, and their CGFB32NC and CGFB32C models are no exceptions. These gas-fired blue flame heaters are designed with user convenience, efficiency, and safety in mind, making them ideal options for both indoor and outdoor use.

One of the main features of the CGFB32NC and CGFB32C is their ability to produce consistent and reliable heat output. These models utilize a blue flame technology, which operates by pulling in air from the surrounding environment and heating it before circulating it throughout the space. This process not only enhances energy efficiency but also ensures that the heat distribution is even, providing a comfortable living or working atmosphere.

In terms of specifications, both models are equipped with variable heat settings, allowing users to customize the temperature according to their specific needs. The CGFB32NC and CGFB32C are also capable of heating spaces up to 1,000 square feet, making them suitable for garages, workshops, and large living areas. Their portability adds to their versatility, as they can easily be transported from one location to another.

Safety is paramount in any heating device, and Desa Tech has incorporated multiple safety features into these models. The CGFB32NC and CGFB32C come with an automatic shut-off valve that activates in case of an accidental tip-over or if the heater overheats, ensuring peace of mind for users. Additionally, both models are certified by the relevant safety standards, assuring consumers of their reliability and secure operation.

Another standout characteristic of these heaters is their straightforward operation. They feature an easy-to-use ignition system, allowing for quick startups without the need for complicated setups. Both models are also designed to run quietly, making them suitable for use in environments where noise levels need to be kept to a minimum.

Durability is a key consideration for any heating appliance, and Desa Tech has focused on quality materials and construction in the CGFB32NC and CGFB32C. These heaters are built to withstand the rigors of daily use, ensuring longevity and providing good value for investment.

Overall, the Desa Tech CGFB32NC and CGFB32C gas-fired blue flame heaters stand out for their efficiency, safety, and user-friendly features. Whether it's for home, garage, or workshop heating needs, these models deliver reliable performance and comfort, making them an excellent choice for countless applications.
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