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OVERHEAD COILING DOORS Section 08330 15-1207 1. The door curtain shall be constructed of interconnected strip stainless steel slats conforming to ASTM A 653. The slats shall be designed by The Cookson Company as No. 45 (measuring 3" high by 7/8" deep) consisting of a 22 gauge exterior slat and a 22 gauge interior slat separated by 13/16" of rigid insulation. The curtain insulation shall not produce a flame spread greater than 25 and a smoke generation greater than 50. 2. The finish on the door curtain shall be stainless steel #4 finish. 3. The bottom bar shall consist of two 1/8" angles mechanically joined together with a 1" diameter vinyl covered foam edge astragal continuous along the bottom. The finish on the bottom bar shall be one (1) coat of bronze rust -inhibiting prime paint. Field finish to match door curtain. 4. The guides shall consist of 3 steel angles bolted together with 3/8" fasteners to form a channel for the curtain to travel. Extruded vinyl snap -on weatherstripping shall be furnished continuously along the exterior leg of each guide. The wall angle portion shall be continuous and fastened to the surrounding structure with either minimum 1/2" fasteners or welds, both on 36" centers. The finish on the guide angles shall be one (1) coat of bronze rust -inhibiting prime paint. Field finish to match door curtain. 5. The brackets shall be constructed of steel not less than 1/4" thick and shall be bolted to the wall angle with minimum 1/2" fasteners. The finish on the brackets shall be one (1) coat of bronze rust -inhibiting prime paint. Field finish to match door curtain. 6. All gears shall be cast iron with teeth cast from machine cut patterns. The pinion gear shall not be less than 3" pitch diameter. The gear ratio shall be designed for a maximum effort of not more than 30 pounds. 7. The barrel shall be steel tubing of not less than 6" in diameter. Oil tempered torsion springs shall be capable of correctly counter balancing the width of the curtain. The barrel shall be designed to limit the maximum deflection to .03" per foot of opening width. The springs shall be adjusted by means of an exterior wheel. The finish on the barrel shall be one (1) coat of bronze rust -inhibiting prime paint. Field finish to match door curtain. 8. The hood shall be fabricated from 24 gauge galvanized steel and shall be formed to fit the curvature of the brackets. The hood shall be corrugated every 1" along the curvature for the entire length of the hood. The hood shall contain a waterproof canvas baffle to control air infiltration. The finish on the hood shall be as indicated in the curtain section. D. Operation: 1. The door shall be operated at a speed of 2/3 foot per second by an open drip -proof electric motor with gear reducer in oil bath. The motor operator shall include a geared limit switch, and an electrically interlocked emergency chain operator. The motor starter shall be housed in a NEMA 1 housing and include a magnetic reversing starter size 0, a 24 volt control transformer, and complete terminal strip to facilitate field wiring. The motor operator shall be activated by a 3 button push-button station in a NEMA 1 enclosure. The motor shall be sized according to door size. The motor operator shall be mounted to the door bracket. All motor operators shall be U.L. listed. Provide interlock switches at motor for emergency shut -down. 2. The service door shall include the Featheredge rolling door safety edge system as manufactured by The Cookson Company and shall include the following features: a. The Featheredge shall be installed on the bottom bar of the door and shall automatically reverse the door if the device detects an obstruction in the 3