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cooling systems from draining and evaporating, contributing to the deterioration of the <br />ductwork thereby endangering person's health and the environment. <br />SECTION 30: 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 in accordance with SMACNA HVAC Duct <br />Construction Standards - Metal and Flexible. Rectangular ducts two (2) <br />inches w.g. shall comply with the SMACNA HVAC Duct Construction <br />Standards - Metal and Flexible. Ducts, plenums, and fittings shall be <br />permitted to be constructed of concrete, clay, or ceramics when installed <br />in the ground or in a concrete 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 in <br />accordance with the Building Code. In Group A, E, H, I, L, and R <br />occupancies, high -rise buildings, and other applications listed in Section <br />1.11.0 regulated by the Office of the State Fire Marshal, corridors shall not <br />be used to convey air to or from rooms except where permitted in <br />accordance with Section 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 shall be permitted to be used as <br />ducts or 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 °C), 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 -XXXX <br />11 A -22 Page 20 of 67 <br />