AIR FOR COMBUSTION AND VENTILATION

Continued

6

DETERMINING 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 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

+

18,000

Btu/Hr

Total

=

 

 

Btu/Hr

58,000

*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)

58,000

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 8.

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 CGN18C, RN30C Determining AIR Flow for Heater Location, Determining if You Have a Confined or Unconfined Space
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CGN18C, RN30C specifications

Desa RN30C and CGN18C are two innovative and efficient models that embody the latest advancements in design and functionality, making them stand out in their respective markets.

The Desa RN30C is primarily recognized for its exceptional performance as a heating solution. With its sleek, modern design, it seamlessly integrates into various settings, whether residential or commercial. This model boasts a high-efficiency rating, ensuring that energy consumption is minimized while providing optimal heating. One of the main features of RN30C is its advanced thermostat control system, which allows users to maintain consistent temperatures effortlessly. Additionally, the RN30C is equipped with a safety shut-off feature that provides peace of mind while using the unit in different environments.

On the other hand, the CGN18C model is recognized for its versatility and capabilities in the realm of cooling systems. Like the RN30C, it features an attractive design, which enhances the aesthetic appeal of any space it occupies. The CGN18C comes with smart technology integration, allowing users to operate the cooling system remotely via smartphone applications. This level of convenience is a significant draw for tech-savvy consumers who prioritize efficiency and ease of use. Furthermore, the CGN18C is designed with energy-saving features, including a programmable timer and eco-mode, to minimize energy costs without sacrificing performance.

Both models incorporate cutting-edge technologies, such as inverter technology, which significantly reduces energy consumption while providing quick and consistent temperature adjustments. They are also compliant with current environmental standards, emphasizing eco-friendliness in their design and operation.

One of the most appealing characteristics of both the RN30C and CGN18C is their durability. Made from high-quality materials, they are built to withstand the test of time, ensuring long-term reliability. Consumers seeking modern heating and cooling solutions will find these models meet the demands of contemporary life, delivering performance, sustainability, and innovation.

In summary, Desa RN30C and CGN18C represent the pinnacle of efficiency and technological advancement, making them ideal choices for anyone looking to upgrade their heating and cooling systems. Their modern features and eco-friendly design showcase a commitment to quality and customer satisfaction that is hard to match.
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