AIR FOR COMBUSTION AND VENTILATION CONTINUED

Providing adequate ventilation

The following is excerpts from National Fuel Gas Code. NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three following ventilation classifications:

1. Unusually Tight Construction; 2. Unconfined Space; 3. Confined Space.

The information on pages 6 through 10 will help you classify your space and provide ad- equate ventilation.

Unusually Tight Construction

The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air.

Unusually tight construction is defined as construction where:

a.Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (6x10-11per pa-sec-m2) or less with openings gasketed or sealed and

b.Weather stripping has been added on openable windows and doors and

c.Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings.

If your home meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Outdoors, page 10.

If your home does not meet all of the three criteria above, proceed to page 8.

Confined Space and Unconfined Space

The National Fuel Gas Code (ANSI Z223.1, 1992 Section 5.3) defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour (4.8m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

*Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.

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United States Stove VFZC32L, VFZC32N installation manual Providing adequate ventilation, Unusually Tight Construction
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VFZC32L, VFZC32N specifications

The United States Stove Company has long been recognized for its quality heating solutions, and the VFZC32N and VFZC32L models exemplify this commitment to excellence. These freestanding vent-free zone heaters are designed to provide efficient and effective heating for residential spaces, showcasing advanced technologies and user-friendly features.

The VFZC32N model, with its natural gas configuration, and the VFZC32L, which operates on propane, offer impressive heating capabilities. Both models can effectively heat areas up to 1,200 square feet, making them suitable for various room sizes in homes, garages, or workshops. They feature a clean, modern design that complements contemporary and traditional decor alike, with a sleek finish that enhances any interior space.

One of the standout characteristics of these heaters is their high-efficiency rating. With a 99% thermal efficiency, the VFZC32 series maximizes heat output while minimizing fuel consumption. This efficiency not only leads to lower energy bills but also results in a more eco-friendly heating solution. The vent-free technology allows these units to operate without the need for venting, simplifying the installation process and providing more flexibility in placement.

Safety features are a priority in the VFZC32N and VFZC32L models. Both heaters come equipped with an oxygen depletion sensor (ODS) that automatically shuts off the heater if oxygen levels fall below a safe threshold. Additionally, the built-in thermostat ensures optimal temperature control, allowing for consistent and comfortable heat throughout the space.

User convenience is further enhanced by the electronic ignition system, which provides hassle-free startups without the need for manual lighting. The adjustable flame height allows users to customize the heat output to suit their specific needs, while the easy-access control panel ensures straightforward operation.

In conclusion, the United States Stove VFZC32N and VFZC32L models represent an excellent choice for those seeking reliable and efficient heating solutions. With their impressive efficiency, modern design, and advanced safety features, these vent-free heaters make it easier than ever to enjoy warmth and comfort at home. Whether you are looking to heat a single room or a larger space, the VFZC32 series is certainly worth considering for your heating needs.
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