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 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 GS675YRVLT instruction manual ALL AIR from Inside Buildings See, ALL AIR from Outdoors See Figures 7, 8
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GS675YRVLT specifications

The State Industries GS675YRVLT is a highly efficient and reliable water heater designed for residential use. It features advanced technologies and specifications that cater to the needs of modern households, making it an excellent choice for those seeking comfort and convenience in their hot water supply.

One of the standout features of the GS675YRVLT is its Energy Star certification, which signifies that it meets strict energy efficiency guidelines set by the U.S. Environmental Protection Agency. This certification not only ensures lower utility bills for homeowners but also contributes to reduced environmental impact, aligning with sustainable practices.

The unit is equipped with a powerful 67-gallon tank, providing ample hot water for larger families or households with high hot water demands. With its recovery rate, it can deliver consistent hot water, making it ideal for simultaneous use in multiple outlets, such as showers, dishwashers, and laundry machines.

A key characteristic of the GS675YRVLT is its durable construction. The tank is built with a glass lining that resists corrosion, extending the life of the water heater and minimizing the need for frequent replacements. Additionally, the reinforced insulation helps retain heat, improving the overall energy efficiency of the system.

The GS675YRVLT utilizes advanced heating technology. It features a high-efficiency gas burner that accelerates the heating process, ensuring quicker access to hot water. The combination of this burner and the unit's insulation means that users benefit from lower energy consumption without sacrificing performance.

Safety is also a priority in the design of this water heater. The GS675YRVLT includes a pressure relief valve, which prevents excessive pressure buildup, and it is equipped with a flame arrestor, minimizing the risk of combustion. These safety features are essential for ensuring peace of mind for homeowners.

User-friendly controls and a digital thermostat are other notable aspects of this unit. They allow for easy temperature adjustments and monitoring of energy usage.

In summary, the State Industries GS675YRVLT is a top-tier water heater that combines energy efficiency, robust construction, advanced technologies, and safety features. It is an ideal solution for those looking to enhance their home's hot water system while also being considerate of energy consumption and environmental responsibility.
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