Provisions for Adequate Combustion and Ventilation Air

This heater shall not be installed in a “ CONFINED SPACE” or unusually tight construction unless provi- sions are provided for adequate combustion and ventilation air.

The NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA 54 defines a “CONFINED SPACE” as a space whose volume is less than 50 cubic feet per 1000 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 1000 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.

Determining if You Have Adequate Combustion and Ventilation Air in Your Space

1.Determine the volume of space, (length x width x height). Include adjoining rooms connected by doorless passageways or ventilation grilles.

Example: A room that is 25’ x 18’ x 8’ has a volume of 3,600 cubic feet. If additional ventilation to adjoining rooms is supplied with grilles or openings, add the volume of these rooms to the total volume of the space.

2.Divide the volume of space by 50 cubic feet. The result is the maximum BTU/Hr the unconfined space can support.

Example: 3,600 cubic feet divided by 50 = 72 or 72,000 BTU/Hr (maximum Btu/Hr the space can support.)

3.Add the BTU/Hr ratings of all fuel-burning appliances installed in the same space. NOTE: Do not include direct vent appliances as these utilize outside air for combustion and vent to the outdoors.

Example: Gas range (55,000 BTU/Hr) + Vent Free Heater (39,000 BTU/Hr) = Total 80,000 BTU/Hr.

4.Compare the maximum BTU/Hr rating the space can support with the total BTU/Hr used by the appliances.

Example: 72,000 BTU/Hr - Max. the space can support. 94,000 BTU/Hr - Total used by the appliances. In this example, the minimum BTU/Hr the space can support is less than the total BTU/Hr used by the appliances. The space is considered “CONFINED SPACE”. Additional air must be provided to meet the requirements of the vent free heater.

If you have no other fuel burning appliances located in the space, then the minimum necessary space you would need for this 39,000 BTU/Hr maximum heater is 1950 cu. ft. An example of such a room would be one with a length of 22’, width of 12’, and a standard 8’ ceiling - 22’ x 11.5’ x 8’ = 2,024 cubic feet.

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, ANSI Z223.1/NFPA 54.

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Vermont Casting UC241N, UC241L, UE181N, UE241N, UC181N, UE241L, UE181L Provisions for Adequate Combustion and Ventilation Air
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UE241N, UE181L, UE181N, UC241L, UC181N specifications

Vermont Casting is renowned for its commitment to quality and craftsmanship when it comes to wood stoves and outdoor fireplaces. Among their impressive lineup, the UE241N, UC181N, UC181L, UE241L, and UE181N models stand out, offering a range of innovative features and technologies designed to enhance your heating experience while maintaining an environmentally friendly footprint.

The UE241N and UE241L are versatile wood stoves with excellent heating capabilities. They feature an efficient combustion system that ensures maximum heat output while minimizing smoke emissions. Both models are designed with Vermont Casting's signature construction, providing durability and longevity. The easy-to-use air control system allows users to easily adjust airflow for optimal burning efficiency, making it suitable for various wood types and moisture levels.

On the other hand, the UC181N and UC181L models offer an elegant and stylish design that complements any home décor. These units come with a large glass door, providing a beautiful view of the fire and enhancing the ambiance of your living space. The UL-approved models are also equipped with an advanced secondary combustion system, which significantly reduces particulate emissions and promotes cleaner burning.

The UE181N is a compact yet powerful heating solution ideal for smaller spaces that require efficient warming. It features a high-efficiency design with a remarkable heating capacity that belies its size, ensuring that even the coldest rooms can be cozy and warm. Its modern, clean lines and black finish enhance its aesthetic appeal, while the efficient design means less time spent refueling and maintaining your fire.

All these models are built with quality craftsmanship and rigorous testing, ensuring they meet the highest standards for both performance and safety. Vermont Casting also prioritizes eco-friendly practices, with each unit adhering to EPA regulations for emissions, making it an ideal choice for environmentally conscious homeowners.

In summary, the Vermont Casting UE241N, UC181N, UC181L, UE241L, and UE181N wood stoves embody a perfect blend of style, efficiency, and sustainability. With their advanced combustion technologies, elegant designs, and durable materials, these stoves promise not just warmth but also a beautiful focal point for any home. With the perfect balance of form and function, these models are truly a testament to Vermont Casting's dedication to excellence in wood heating solutions.
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