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ESR-1308 | Most Widely Accepted and Trusted Page 18 of 21 10. Hanger Wire: Number 12 SWG galvanized wire must be twist-tied to steel joists or cold-rolled steel channels. When the ceiling consists of nominal 24-by-24-inch panels or 24-by-48-inch panels, hanger wires must be spaced a maximum of 48 inches on center on main runners adjacent to cross tee intersections. Hanger wires must occur at all four corners of light fixtures, at midspan of cross tees adjacent to 4-foot light fixtures and air duct outlets, and adjacent to each main runner splice. When the ceiling consists of nominal 20-by-60-inch panels, hanger wires must be spaced 40 inches on center along main runners, and one wire must occur at each corner of light fixtures, at midspan of all cross tees, and adjacent to each main runner splice. 11. Air Duct: Minimum 0.019-inch-thick (26 gage) galvanized steel. Total area of duct openings must not exceed 576 square inches per each 100 square feet of ceiling area. Area of individual duct openings must not exceed 576 square inches. Maximum opening dimension is 18 inches. Inside and outside faces of duct throat must be protected with 1/16-inch-thick ceramic fiber paper, laminated to the metal. Maximum dimension of opening is 30 inches. Duct supported by 11/2-inch-deep, minimum 0.053-inch-thick (16 gage) cold-rolled steel channels spaced not over 48 inches on center, suspended by No. 12 SWG galvanized steel wire. 12. Damper: Minimum 0.056-inch-thick (16 gage) galvanized steel, sized to overlap duct opening a minimum of 2 inches. Protected on both sides with 1/16-inch-thick ceramic fiber paper, laminated to the metal, and held open with a fusible link. 13. Fixtures, Recessed Light: Fluorescent-lamp-type steel housing, nominally 2 by 4 feet or 20 by 60 inches in size. Fixtures must be spaced so their total area does not exceed 24 square feet per each 100 square feet of ceiling area. When 20-by-60 inch fixtures must be used, fixture stabilizers formed from No. 16 gage steel channels, must be used in addition to the hanger wires at midspan of the cross tees. Fixture must be wired in conformance with the National Electrical Code. Fixture and ballasts must be considered for ambient temperature conditions before installation. 14. Fixture Protection—Acoustical Material—Armstrong World Industries, Inc.: Type 5/8-inch P (S) or 5/8-inch PC (S) is cut to form a five-sided enclosure, trapezoidal in cross section, approximately 1/2 inch longer and wider, and 5/8 inch higher, than the light fixture housing. For 2-by-4-foot fixtures, the protection consists of a 233/ 4-by-473/4-inch top piece, two 5 7/8-by-473/4-inch side pieces, and two 41/2-by-233/4-inch end pieces. For 20-by-60-inch fixtures, the protection consists of a nominal 20-by-60-inch top piece, two nominal 6-by- 60-inch side pieces, and two nominal 41/2-by-20-inch end pieces. The top edge of each fixture protection side piece may be provided with a 1-inch-deep-by-maximum-20-inch-long notch near its midpoint. The side and top pieces must be laid in place and the end pieces must be held in place with three 8d nails spaced 8 inches on center. (S) - Surface perforations. 15. Steel Framing Members—Armstrong World Industries, Inc.: Type 8500 systems with a 15/16-inch-wide flange grid must be used. Main runners, nominally 12 feet long, must be spaced 4 feet on center. Cross tees, nominally 4 feet long, must be installed perpendicular to main runners and spaced 2 feet on center. Cross tees, nominally 2 feet long, must be installed perpendicular to 4-foot cross tees and spaced 4 feet on center. Grid modules containing light fixtures must employ a fixture-centering clip at each corner. The No. 24 gage electrogalvanized steel clip is nested on the flange of the intersecting grid tees, has two 1 7/16-inch-long legs with their sides perpendicular to each other, and has a U-shaped return at the top of each leg for engaging over the bulb of the intersecting grid tees. 16. Acoustical Material: Nominal 24-by-24-inch or -48-inch lay-in panels. Border panels must be supported at walls by minimum 0.016-inch- thick (26 gage) painted steel angles with 7/ 8-inch legs; or, minimum 0.016-inch-thick (26 gage) painted steel channels, 1 1/8 inches deep with 7/8-inch flanges. 17. Hold-down Clips: (Not shown) Number 24 MSG spring steel, placed over cross tees at 2 feet on center. FIGURE 6—8500 SERIES ONE-HOUR FIRE-RESISTANCE-RATED ASSEMBLY (Continued) 1. Beam: 2. Normal-weight Concrete 3. Welded Wire Fabric 4. Steel Form Units 5. Steel Joists 6. Bridging 7. Hanger Wire 8. Air Duct 9. Damper: No. 16 MSG minimum galvanized steel, sized to overlap duct opening 2 inches, minimum. Protected on both sides with 1/16-inch-thick ceramic fiber paper laminated to the metal with adhesive and held open with a listed fusible link. 10. Fixtures, Recessed Light 11. Fixture Protection—Batts and Blankets 12. Steel Framing Members—Worthington Armstrong Venture 13. Acoustical Material 14. Hold-down Clips (Not illustrated) For SI: 1 inch = 25.4 mm. FIGURE 7—TWO-HOUR FIRE-RESISTANCE-RATED FLOOR-CEILING ASSEMBLY (REFER TO SECTION 4.6 OF THIS REPORT) 2130 E 17th St - 10111279406/07/23