FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

6

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

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

+

10,000

BTU/Hr

Total

=

 

 

BTU/Hr

50,000

*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: 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 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.

WARNING

WARNING ICON

G 001

You must provide additional ventilation air in a confined space.

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Vanguard Heating VN12A, VN6B installation manual Determining FRESH-AIR Flow for Heater Location

VN6B, VN12A specifications

The Vanguard Heating VN6B and VN12A represent cutting-edge solutions in residential heating technology. Designed to meet a variety of heating needs, these systems combine efficiency and user-friendly features, catering to an increasingly eco-conscious market.

The VN6B model is ideal for smaller homes or spaces, boasting a compact design without sacrificing power. It uses advanced condensing technology, which allows it to achieve impressive efficiency ratings. With an Annual Fuel Utilization Efficiency (AFUE) of up to 96%, the VN6B maximizes heat output while minimizing fuel consumption. This leads to significant cost savings on heating bills, making it an attractive choice for homeowners looking to upgrade their heating systems.

Meanwhile, the VN12A is built for larger areas, providing robust heating solutions for bigger residential spaces. With similar condensing technology, it features an AFUE rating that matches its smaller counterpart, ensuring that it also operates with remarkable efficiency. The VN12A is engineered with a modulating burner, which adjusts the flame size according to the building’s heating needs. This means it can operate quietly and smoothly, offering comfort without the jarring temperature fluctuations that other systems may create.

Both models incorporate innovative safety features, including a built-in flue gas condensation sensor that ensures safe operation under varied conditions. Additionally, they include a user-friendly digital thermostat, which enables precise temperature control and can be programmed for optimal efficiency. Homeowners can easily customize their heating schedule, making it convenient to maintain a comfortable living environment while also conserving energy.

Another notable characteristic of the Vanguard VN6B and VN12A is their durable construction. Made from high-quality materials, these heating units are designed to withstand wear and tear, ensuring a long lifespan with minimal maintenance. Regular maintenance reminders are a feature, making it straightforward for homeowners to keep track of service needs.

In summary, the Vanguard Heating VN6B and VN12A models stand out in the market for their exceptional efficiency, smart technologies, and user-centric features. They are excellent choices for homeowners seeking reliable and environmentally friendly heating solutions that promise comfort year-round, all while keeping energy costs low.