AIR FOR COMBUSTION

AND VENTILATION

Continued

DETERMINING FRESH-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 door- less 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.Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.

__________ (volume of space) x 20 = (Maxi- mum Btu/Hr the space can support)

Example: 3168 cu. ft. (volume of space) x 20 = 63,360 (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

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

Example:

Gas water heater

 

40,000

Btu/Hr

Vent-free fireplace

+

39,000

Btu/Hr

Total

=

79,000

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: 63,360 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 maxi- mum 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 adjoin- ing 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 9.

B.Vent room directly to the outdoors. See Ventila- tion Air From Outdoors, page 9.

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 maxi- mum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA54 Section 5.3 or applicable local codes.

8

www.desatech.com

116746-01A

Page 7 Page 9
Page 8
Image 8
Desa VSGF36NTA Determining FRESH-AIR Flow for Heater Location, Determining if You Have a Confined or Unconfined Space
Page 7 Page 9

VSGF36NRA, VSGF36NTA, VSGF36PTA, VSGF36PRA specifications

Desa VSGF36PRA, VSGF36PTA, VSGF36NTA, and VSGF36NRA are various models from a contemporary line of gas fireplaces that combine aesthetics, functionality, and advanced technology to enhance residential spaces. Each model offers unique features and characteristics designed to meet different consumer needs and preferences.

The VSGF36PRA model stands out with its radiant heat and realistic flame display, effectively mimicking the experience of a traditional wood-burning fireplace. Its easy installation process makes it a viable choice for both new constructions and retrofitting existing spaces. The model utilizes high-efficiency gas burning technology, ensuring a warm and cozy environment while maintaining energy savings. Furthermore, it boasts a stylish design that can seamlessly integrate into any living room setting.

The VSGF36PTA is another dynamic addition to the lineup, featuring a traditional appearance with modern advancements. This model is known for its programmable thermostat that allows homeowners to control the temperature more precisely. The patented burner system creates a beautiful and lifelike flame, adding to the ambiance of any room. Additionally, the VSGF36PTA is equipped with a safety shut-off feature, ensuring peace of mind for users.

In contrast, the VSGF36NTA model targets those who appreciate a contemporary design. With its sleek lines and minimalistic facade, it offers an elegant touch to modern homes. This model incorporates advanced electronic ignition and a remote control for effortless operation, allowing users to enjoy their fireplace with convenience. The high-efficiency venting system also ensures optimal performance with lower emissions, making it environmentally friendly.

Lastly, the VSGF36NRA model combines both performance and versatility. This unit is designed for flexible installation options, allowing it to fit into various spaces. The customizable flame height and adjustable fan speed are key features that enhance the user experience. In terms of heating capabilities, the VSGF36NRA is engineered to provide reliable warmth during colder months while ensuring high efficiency.

Overall, the Desa VSGF36 series offers a diverse range of options suitable for various aesthetic preferences and functional needs. Each model features cutting-edge technology, ensuring that homeowners can enjoy the beauty and warmth of a fireplace while benefiting from enhanced efficiency and safety features.
Top Page Image Contents