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 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

Example:

 

 

 

Gas furnace

 

____________________ Btu/Hr

Gas water heater

 

40,000

Btu/Hr

Vented gas heater

 

____________________ Btu/Hr

Vent-free fireplace

+

33,000

Btu/Hr

Gas fireplace logs

 

____________________ Btu/Hr

Total

=

73,000

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 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) 73,000 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 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/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, 1992, Section 5.3 or applicable local codes.

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Desa LFP33PR installation manual AIR for Combustion Ventilation, Determining FRESH-AIR Flow for Fireplace Location
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LFP33PR specifications

Desa LFP33PR is a notable model within the LFP series, renowned for its advanced features and superior technology. Designed primarily for both residential and commercial applications, the LFP33PR combines efficiency with user-friendly functionality.

One of the standout features of the Desa LFP33PR is its robust energy performance. It is equipped with an advanced heating element that maximizes energy output while minimizing consumption. This energy-efficient design not only reduces utility costs but also aligns with contemporary sustainability goals, making it an environmentally friendly choice for users.

In terms of safety, the Desa LFP33PR incorporates multiple safety mechanisms. These include an automatic shut-off feature that activates when overheating is detected. Additionally, it comes with a built-in flame sensor and a robust housing design that prevents any risk of accidental burns. This focus on safety ensures peace of mind for users, whether in a family home, office environment, or industrial setting.

The LFP33PR also boasts a compact and portable design, making it easy to move from room to room or to different areas within a facility. This portability does not compromise its durability; the unit is constructed with high-quality materials designed to withstand regular use.

Furthermore, the technology integrated into the Desa LFP33PR elevates user experience significantly. It features an intuitive control panel that allows for easy temperature adjustments and timer settings. Users can also benefit from remote control functionality, enabling them to regulate the heating system from a distance.

The aesthetic design of the LFP33PR is another appealing characteristic. Its sleek exterior is available in various colors and can blend seamlessly with different interior styles. This attention to aesthetic detail not only enhances functionality but also ensures that the device adds an element of style to any space.

Maintenance of the Desa LFP33PR is straightforward, with features that allow easy access for cleaning and servicing. The design also minimizes dust accumulation, ensuring optimal performance over time.

In summary, the Desa LFP33PR is a state-of-the-art heating solution, characterized by its efficiency, safety, portability, user-friendly technology, and appealing aesthetics. Its thoughtful design and advanced features make it an excellent choice for those seeking both comfort and reliability in their heating appliances.
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