Vent, special gas vent, or plastic piping installed within a
The remaining space surrounding a chimney liner, gas. Horizontal upper combustion air ducts shall not slopeĭownward toward the source of combustion air. Vertically from the adjoining finished ground level. the building shall have the lowest side of the combustionĪir intake openings located at least 12 inches (305 mm). Ducts shall not be screened where terminating in an attic. The separationīetween ducts serving upper and lower combustionĪir openings shall be maintained to the source of Ducts shall not serve both upper and lower combustionĪir openings where both such openings are used. Ducts shall terminate in an unobstructed space, allowingįree movement of combustion air to the appliances. Joist spaces shall not be prohibited from conveying combustionĪir, provided that not more than one fireblock is FIGURE 506.4.1(3)Įxception: Within dwelling units, unobstructed stud and INLET AIR FROM VENTILATED CRAWL SPACE AND Horizontal ducts, each opening shall have a minimumįree area of 1 square inch per 2000 Btu/h (0.001Įnclosure. Where communicating with the outdoors through. M 2/kW) of total input rating of all appliances in theĮnclosure. Where communicating to the outdoors through verticalĭucts, each opening shall have a minimum freeĪrea of 1 square inch per 4000 Btu/h (0.0005 Where directly communicating with the outdoors or. The openings shall communicateĭirectly, or by ducts, with the outdoors or spaces thatįreely communicate with the outdoors, as follows: Within 12 inches (305 mm) of the bottom of the enclosure, (305 mm) of the top of the enclosure and one commencing Permanent openings, one commencing within 12 inches 
2 Solar water heaters shall be sized to meet the appropriate first-hour rating as shown in the table.1 The first-hour rating is found on the "Energy Guide" label.Shall be permitted in accordance with Section 504.3.2. Listed appliances shall be installed in accordance with the manufacturer's
A list of accepted water heaterĪppliance standards is referenced in Table 501.1(1). The type and model of each size thereof approved by theĪuthority Having Jurisdiction. No water heater shall be hereinafter installed that does notĬomply with the manufacturer's installation instructions and The minimum capacity for storage water heaters shall be inĪccordance with the first-hour rating listed in Table 501.1(2). Water, together with chimneys, vents, and their connectors. Govern the construction, location, and installation of fuel-burningĪnd other types of water heaters heating potable
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