OWNER’S MANUAL

AIR FOR

COMBUSTION AND

VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER 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 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 18 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2304 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: 2304 cu. ft. (volume of space) ÷ 50 cu. ft. = 46.1 or 46,100 (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

Example:

 

 

 

Gas water heater*

___________________ Btu/Hr

 

 

 

Gas water heater

 

40,000

Btu/Hr

Gas furnace

___________________ Btu/Hr

 

Vent-free heater

+

10,000

Btu/Hr

Vented gas heater

___________________ Btu/Hr

Total

=

50,000

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.

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: 46,100 Btu/Hr (maximum the space can support) 50,000 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 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 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.

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, ANS Z223.1, Section 5.3 or applicable local codes.

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Desa FA-2B installation manual AIR for Combustion Ventilation, Determining FRESH-AIR Flow for Heater Location

FA-2B specifications

Desa FA-2B is a highly advanced facility designed for modern eco-friendly living, combining sustainability with cutting-edge technology to create a harmonious environment. One of the standout features of the Desa FA-2B is its commitment to zero energy use, achieved through a range of innovative technologies that harness renewable resources.

At the core of Desa FA-2B is its extensive use of solar energy. The facility is equipped with solar panels that generate power sufficient to meet the energy needs of its residents. This solar infrastructure not only reduces reliance on conventional energy sources but also contributes to lowering overall carbon emissions. Additionally, the integration of energy storage systems allows for the accumulation and usage of solar energy during nighttime or cloudy days.

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In summary, Desa FA-2B exemplifies the future of sustainable living through its innovative technologies, commitment to energy efficiency, and community-oriented design. By integrating solar power, water conservation systems, smart technologies, and open architectural designs, Desa FA-2B offers a blueprint for eco-friendly living that prioritizes both environmental sustainability and resident comfort.