A. Type: Commercial Sheet Doors to be manufactured by Asta Door Corporation.
B. Operation: to be rope pull or hand chain operated depending on size.
C. Mounting: to be interior face mounted on a prepared opening.
A. Opening preparation, access panels, finish or field painting are in the scope of the work of other sections or trades.
A. Sheet: 26 gauge galvanized grade 80 full hard steel roll formed in continuous corrugation. Galvanized according to A.S.T.M. A653-G60 and finished with baked epoxy primer and baked polyester topcoat.
B. Side Stripping: p.v.c. rubber to be attached to curtain edges.
C. Bottom Bar: curtain to be reinforced with a bottom bar consisting of 2” x 1-1/2” x 12 gauge galvanized steel angle with E.P.D.M. astragal.
A. Drum: to be formed with 26 gauge galvanized steel sheet rolled around and attached to stamped 16 gauge galvanized steel drums to restrict deflection to .03″ per foot (2.5 mm/m) of door width.
B. Springs: to be oil tempered, grease packed helical torsion type designed to cycle 12,500 times with an overload factor of 25%. Springs are to be mounted on a 1-5/16” (25.4mm) hot rolled steel tubing of minimum 14 gauge.
A. Support Brackets: to be 3/16″ (4.76mm) thick structural steel angles and a 1/4″ (6.35mm) thick steel diagonal brace welded in a triangular form to support ends of drum assembly.
A. Rope Pull: to be 1/4″ (6.35mm) polyester rope attached to bottom angle up to 10′ x 10′ (3048mm x 3048mm) doors.
B. Chain Hoist: to be cast iron pocket wheel drive with machine link hand chain for over 10′ X 10′ (3048mm x 3048mm) doors.
A. Guides: to be roll formed 16 gauge galvanized steel channels.
B. Guide Depth: 2-1/2” deep per side to provide sheet penetration adequate for proper operation.
WEATHER SEAL (Optional)
A. Side Draft Seal: Brush seal with aluminum retainer (field installed).
B. Top Draft Stop: to be E.P.D.M. seal attached to top of curtain to seal against header (field installed).
A. Hand Chain Lock: bracket, to be mounted on guide angle or wall for chain operated doors.
B. Curtain Lock: to be hardened galvanized steel slide bolts attached to bottom angle suitable for padlocking. (padlock by others)
- Ungalvanized Surfaces: to be shop coated with rust reducing black prime paint.