Combustion Air and Ventilation for Appliances Located in Unconfined Spaces

UNCONFINED SPACE is space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 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.

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.), additional air may need to be provided using the methods described in Combustion Air and Ventilation for Appliances Located in Confined Spaces.

Combustion Air and Ventilation for Appliances Located in Confined Spaces

CONFINED SPACE is a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kW) of the aggregate input rating of all appliances installed in that space.

A.ALL AIR FROM INSIDE BUILDINGS:

(See Figure 10 on page 11 and Figure 11 below)

The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 Btu per hour (22 cm2/kW) of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches (645 cm2). One opening shall commence within 12 inches (30 cm) of the top and one commencing within 12 inches (30 cm) of the bottom of the enclosures.

FIGURE11.

B. ALL AIR FROM OUTDOORS: (See Figures 12, 13 and 14)

The confined space shall be provided with two permanent openings, one commencing within 12 inches (30 cm) of the

top and one commencing within 12 inches (30 cm) from the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

FIGURE12.

•When directly communicating with the outdoors, each opening shall have a minimum free area of 1 square inch per 4,000 Btu per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure, see Figure 12.

•When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure, see Figure 13.

FIGURE13.

•When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 BTU per hour (11 cm2/kW) of total input rating of all equipment in the enclosure, see Figure 14.

•When ducts are used, they shall be of the same cross- sectional area as the free area of the openings to which they connect. The minimum short side dimension of rectangular air ducts shall not be less than 3 inches (76.2 mm), see Figure 14.

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Maytag HRN11240X, HRN11250Q, HRP31240X, HRP11240X, HRP11250X, HRP31250Q, HRN31240X, HRN31250Q manual ALL AIR from Inside Buildings
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HRN31250X, HRN11250X, HRP11250Q, HRP31250X, HRN31250Q specifications

The Maytag HRP11240X, HRP31250X, HRP11250Q, HRN11250X, and HRN11240X are a range of high-performance refrigerators designed to meet the needs of modern households. These models are well-known for their reliability, innovative features, and user-friendly design, making them a popular choice among consumers looking for durable refrigeration solutions.

One of the standout features of these Maytag models is their robust construction, which includes a stainless-steel exterior that not only offers a sleek appearance but also resists fingerprints, making it easy to maintain. The interiors are spacious and designed for optimal organization, with adjustable shelving that allows for customizable storage options. Families can easily store large items, such as party trays and oversized bottles, thanks to the flexible space configurations.

All these models are equipped with Maytag's PowerCold feature, which quickly cools the refrigerator after the door has been open for an extended period. This technology is especially beneficial during grocery trips, ensuring that perishables remain fresh and properly chilled. In addition, the temperature management system ensures consistent cooling by monitoring temperature fluctuations and adjusting accordingly.

The HRP11250Q and HRP31250X also come with the advanced FreshLock crispers, which are designed to maintain optimal humidity levels for fruits and vegetables, prolonging their freshness. The humidity-controlled environment is crucial for preserving the taste and nutrition of your produce.

Further enhancing the user experience, the Maytag refrigerators feature a bright LED interior lighting system, allowing users to easily find items even in the back of the fridge. The EnergyStar certification on these models indicates that they are energy-efficient, helping to lower utility bills while also being eco-friendly.

The models HRN11250X and HRN11240X offer additional convenience with their easy-to-use digital controls located at the front, providing intuitive access to adjust settings quickly. They also feature a reversible door hinge option, giving homeowners flexibility in installation and ensuring the refrigerator fits seamlessly into their kitchen layout.

Overall, the Maytag HRP11240X, HRP31250X, HRP11250Q, HRN11250X, and HRN11240X refrigerators exhibit a great blend of functionality, style, and durability, making them an excellent investment for any household. With their advanced technologies and thoughtful design features, these models are tailored to enhance everyday life while ensuring food preservation is taken care of efficiently.
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