located in the above manner, should be provided. Each opening should have a free area of not less than one square inch per 4000 Btu/hr (5.5 cm2/kW) of total input of all appliances in the enclosure. If horizontal ducts are used, each opening should have a free area of not less than one square inch per 2000 Btu/hr (11cm2/kW) of the total input of all appliances in the enclosure.

A. ALL AIR FROM INSIDE BUILDINGS: (See Figure 5 and 6)

The confined space should 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 should be considered in making this determination. Each opening should 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 should commence within 12 inches (30 cm) of the top and one commencing within 12 inches (30 cm) of the bottom of the enclosures.

FIGURE 6.

B. ALL AIR FROM OUTDOORS: (See Figures 7, 8, 8B and 9)

The confined space should 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 should communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

1.When directly communicating with the outdoors, each opening should 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 7.

FIGURE 7.

2.When communicating with the outdoors through vertical ducts, each opening should 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 8.

3.When communicating with the outdoors through horizontal ducts, each opening should 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 9.

FIGURE 8.

FIGURE 8B.

5.Alternatively a single permanent opening may be used when communicating directly with the outdoors, or with spaces that freely communicate with the outdoors. The opening shall have a minimum free area of 1 square inch per 3,000 BTU per hour (8.3 cm2/kW) of total input rating of all equipment in the enclosure. See Figure 8B.

4.When ducts are used, they should 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 should not be less than 3 inches (7.6 cm), see Figure 9.

FIGURE 9.

5.Louvers and Grilles: In calculating free area, consideration should be given to the blocking effect of louvers, grilles or screens protecting openings. Screens used should not be smaller than 1/4 inch (6.4 mm) mesh. If the free area through a design of louver or grille is known, it should be used in calculating the size opening required to provide the free area specified. If the design and free area is not known, it may be assumed that wood louvers will be 20-25 percent free area and metal louvers and grilles will have 60-75 percent free area. Louvers and grilles should be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation.

6.Special Conditions Created by Mechanical Exhausting or Fireplaces: operation of exhaust fans, ventilation systems, clothes dryers or fireplaces may create conditions requiring special attention to avoid unsatisfactory operation of installed gas utilization equipment.

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State Industries GS675HRVIT, GS675YRVIT ALL AIR from Inside Buildings See, ALL AIR from Outdoors See Figures 7, 8, 8B
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GS675HRVIT, GS675YRVIT specifications

The State Industries GS675HRVIT and GS675YRVIT are high-efficiency water heaters designed to meet the growing demand for reliable and energy-efficient hot water solutions. These models are ideal for both residential and light commercial applications, offering a blend of advanced technology, durable construction, and user-friendly features.

One of the standout characteristics of the GS675HRVIT and GS675YRVIT is their compact design, which makes them easy to install in various spaces without compromising performance. Both units are equipped with a high-efficiency gas burner that provides rapid water heating capabilities. Their power input allows for quick recovery rates, ensuring a steady supply of hot water when needed.

Energy efficiency is a key feature of these models. They utilize advanced insulation materials and designs that minimize heat loss, thus significantly reducing energy consumption. This not only contributes to lower utility bills but also supports environmental sustainability efforts by lowering carbon footprints. Both models are designed to meet or exceed Energy Star certification standards, highlighting their commitment to energy conservation.

In terms of technology, the GS675HRVIT and GS675YRVIT incorporate robust safety features, including a temperature and pressure relief valve that prevents dangerous pressure build-up, as well as an electronic ignition system that improves reliability by eliminating the need for a standing pilot light. Additionally, the gas control valve ensures precise regulation of the water temperature, enhancing safety and comfort for users.

Durability is another hallmark of these water heaters. Constructed with high-quality materials, the units feature a glass-lined tank that resists corrosion, extending the lifecycle of the product. They also come with a comprehensive warranty, providing peace of mind for consumers regarding their investment.

Users will appreciate the convenience that the GS675HRVIT and GS675YRVIT models offer, including easy-to-use controls and clear indicators for operational status. Installation and maintenance are simplified, making it straightforward for both homeowners and professionals to manage the unit over time.

Overall, State Industries GS675HRVIT and GS675YRVIT are excellent choices for anyone looking for efficient, reliable, and durable water heating solutions. With their innovative technology, energy-saving features, and user-friendly design, these models stand out in the competitive market of hot water heaters.
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