a free area of one square inch per 1000 Btu/hr (22 cm2/kW) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 cm2).

If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors. When directly communicating with the outdoors or communicating through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall 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 shall 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 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.

FIGURE 6.

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

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.

1.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 7.

FIGURE 7.

2.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 8.

3.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 9.

FIGURE 8.

4.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 (7.6 cm), see Figure 9.

FIGURE 9.

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 enclosure. See Figure 9A.

FIGURE 9.

6.Louvers and Grilles: In calculating free area, consideration shall be given to theblockingeffectoflouvers,grillesorscreensprotectingopenings.Screens usedshallnotbesmallerthan1/4inch(6.4mm)mesh.Ifthefreeareathrough 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 shall be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation.

7.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 Power Vent/Power Direct Vent Gas Models instruction manual ALL AIR from Inside Buildings See
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Power Vent/Power Direct Vent Gas Models specifications

State Industries offers a range of power vent and power direct vent gas models that cater to various residential and commercial heating needs. These models are designed for efficiency, safety, and convenience, making them a popular choice among consumers seeking reliable water heating solutions.

One of the standout features of State Industries' power vent models is their ability to vent directly through walls or roofs, enabling installation in locations where traditional venting methods may pose challenges. This flexibility makes them ideal for homes without suitable chimney access. The power vent system employs a fan to push exhaust gases out, ensuring efficient operation even in cases where vertical venting is not feasible.

The power direct vent models take this a step further by utilizing sealed combustion technology. This means they draw air for combustion from outside the home, which significantly reduces the risk of backdrafts and improves indoor air quality. The dual-venting system of these models also enhances their efficiency, as it allows for better control of air flow and exhaust.

State Industries incorporates advanced technologies in their gas models, including electronic ignition systems that eliminate the need for a standing pilot light. This feature not only enhances energy efficiency but also adds convenience for users. Moreover, these models come equipped with LED indicators that provide real-time status updates, enabling users to monitor their units easily.

Durability and reliability are hallmarks of State Industries products. The tanks are constructed with high-quality materials and feature protective coatings that inhibit corrosion, ensuring a long lifespan. In addition to this, many models are backed by extended warranties, providing peace of mind for consumers.

Energy efficiency is a critical characteristic of these gas models, with many units meeting or exceeding energy efficiency standards set by the Environmental Protection Agency (EPA). This results in lower utility bills and a reduced environmental impact. With adjustable temperature settings, users can optimize their water heating experience while conserving energy.

In conclusion, State Industries' power vent and power direct vent gas models stand out for their flexibility in installation, advanced technologies, and energy-efficient operation. Whether for residential or commercial use, these models offer high performance and reliability, ensuring that users enjoy a consistent and efficient hot water supply.
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