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SECTION 8816. Duct Material. Table 9-B is amended to read as follows: TABLE 9-B METAL DUCT AND FITTING GAUGE For Residential Air Ducts Diameter Nominal Equiv. Galv. Approx. Min. Weight or Width, Thickness Sheet, U.S. Aluminum Tinplate, Lbs. Inches Inches Gauge No. B & S Gauge Per Base Box ROUND DUCTS AND ENCLOSED RECTANGULAR DUCTS 14 or less 0.016 30 26 135 over 14 0.019 28 24 EXPOSED RECTANGULAR DUCTS 14 or less 0.019 28 24 over 14 0.022 26 23 NOTE: Enclosed means surrounded on four sides by material that will provide adequate support and mechanical and weather protection for the ducts. SECTION 8817. Vent and Chimney Selection. Table 10A is amended by adding the following in COLUMN I: 11. Room heating stoves. SECTION 8818. Chimney Connector Material. The table in paragraph 1 of Section 1006(a) is amended by changing the heading of the left hand column to read "Non-Corrosive Gauge No." SECTION 8819. Air for Combustion and Ventilation. Paragraph 1 of Section ll01(b) is amended to read as follows: 1. One-twentieth of the maximum rated input in BTU's of gas burning appliances, other than listed ranges, hot plates, and refrigerators in such space. SECTION 8819.1. Air for Combustion and Ventilation. Paragraph 4 of Section ll01(c) is amended to read as follows: 4. Specially Engineered Installation. The size of combustion air openings specified in this section shall not govern when special engineering or listing assures an adequate supply of air for combustion, vent/]ation and draft hood dilution. SECTION 8819.2. Air for Combustion and Ventilation. Paragraph 2 of Section l102(d) is amended to read as follows: 2. Closer than ten (10) feet from any appliance vent outlet, unless such vent outlet is at least three (3) feet above circulating air inlet. SECTION 8820. Sizinq of Heatinq Appliances and Distribution Ducts. Paragraph A.2(a)4 of Appendix A is amended to read as follows: 4. That the heat delivery efficiency of the warm air distributing system of a warm air heating system is seventy (70) percent. SECTION 8821. Coolinq Towers, Paragraph F.l(g) (2) of Appendix F is amended by adding a third sentence to read as follows: However, in no case shall such water be spilled on any street, highway, or adjacent property, or in any potable water source. -28-