AIR FOR COMBUSTION AND VENTILATION

Continued

6

DETERMINING AIR FLOW FOR HEATER 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 heater 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 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 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: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)

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

Example: Gas water heater

 

40,000

Btu/Hr

Vent-free heater

+

39,000

Btu/Hr

Total

=

 

 

Btu/Hr

79,000

*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: 51,200

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. 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 provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 7.

C.Install a lower Btu/Hr heater, 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.

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Desa CGD3018P Determining AIR Flow for Heater Location, Determining if You Have a Confined or Unconfined Space
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CGD3018P specifications

The Desa CGD3018P is an innovative gas-fired heater designed to enhance comfort and efficiency in your home. This model combines advanced technologies with user-friendly features to deliver a reliable heating solution ideal for various spaces, including living rooms, basements, and workshops.

One of the standout features of the CGD3018P is its powerful heating capacity. With an output of up to 30,000 BTU per hour, this heater can quickly warm up a sizable area, making it perfect for those colder months when temperatures drop significantly. Its efficient heating design ensures that energy consumption remains manageable while providing heartwarming comfort.

This unit employs a modern, design-friendly aesthetic that complements a range of interior styles. The contemporary appearance is often characterized by clean lines and a sleek finish, making it an attractive addition to any room. The heater is also equipped with a built-in fan, enhancing air circulation and ensuring even heat distribution throughout the area.

The Desa CGD3018P features a thermocouple safety mechanism, which automatically shuts off the gas supply if the pilot light goes out, ensuring that safety is a top priority. Moreover, the piezo ignition system allows for quick and easy start-up, eliminating the need for matches or external ignition sources.

Adaptability is another key characteristic of this model. It can be operated using an LPG (liquefied petroleum gas) or natural gas source, making it suitable for diverse applications and user preferences. This versatility provides homeowners with the flexibility to choose their gas type based on availability and convenience.

Additionally, the heater includes adjustable heat settings, allowing users to customize their comfort levels. Whether you prefer a gentle warmth or robust heat output, the Desa CGD3018P can accommodate a range of heating needs.

Finally, the ease of installation sets this model apart. With straightforward assembly and minimal maintenance requirements, it provides hassle-free operation for homeowners looking to enhance their heating solutions. The Desa CGD3018P is undoubtedly an excellent enhancement for any space, offering both style and functionality with modern proactive safety technologies, ensuring peace of mind while keeping you warm.
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