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• SECTION 39: That section 8 -570 of the Santa Ana Municipal Code is hereby amended <br />such that it reads as follows: <br />Sec. 8 -570. Ducts -- Material (Section 602.1). <br />Section 602.1 of the mechanical code is amended to read as follows: <br />602.1 General. Supply air, return air, and outside air for heating, cooling, <br />or evaporative cooling systems shall be conducted through duct systems <br />constructed of metal as set forth in the ANSI /SMACNA 006 -2006 HVAC <br />Duct Construction Standards - Metal and Flexible, or another approved <br />duct construction standard. Rectangular ducts in excess of two (2) inches <br />w.g. shall comply with the ANSI /SMACNA 006 -2006 HVAC Duct <br />Construction Standards - Metal and Flexible, or another approved duct <br />construction standard. Ducts, plenums, and fittings may be constructed of <br />concrete, clay, or ceramics when installed in the ground or in a concrete <br />slab, provided the joints are tightly sealed. <br />In other than Group A, E, H, I, L, and R occupancies, high -rise buildings, <br />and other applications listed in Section 1. 11.0 regulated by the Office of <br />the State Fire Marshal, corridors shall not be used to convey air to or from <br />rooms if the corridor is required be of fire - resistive construction per the <br />• Building Code. In Group A, E, H, I, L, and R occupancies, high -rise <br />buildings, and other applications listed in Section 1.11.0 regulated by the <br />Office of the State Fire Marshal, corridors shall not be used to convey air <br />to or from rooms except where permitted in accordance with Section <br />1018.5 of the California Building Code. <br />Exception: [OSHPD 1, 2, 3 & 4] (See Section 407.4.1.3). <br />Not permitted for [OSHPD 1, 2, 3 & 4] Concealed building spaces or <br />independent construction within buildings may be used as ducts or <br />plenums. <br />When gypsum products are exposed in ducts or plenums, the air <br />temperature shall be restricted to a range from 50 °F (10 °C) to 125 °F <br />(52 0C), and moisture content shall be controlled so that the material is not <br />adversely affected. For the purpose of this section, gypsum products shall <br />not be exposed in ducts serving as supply from evaporative coolers, and <br />in other air - handling systems regulated by this chapter when the <br />temperature of the gypsum product will be below the dew point <br />temperature. <br />See Chapter 8 for limitations on combustion products venting systems <br />extending into or through ducts or plenums. <br />Ordinance No. NS -2810 <br />Page 15 of 43 <br />