(4) Drums: All drums are fitted with a grease filled, shielded radial ball bearing for a smoother operation. 12” diameter drums allow for lower headroom requirements.
(5) 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. (6) Steel Mounting Plates: For lateral jamb extension to provide door support. (7) Guides: To be roll formed 16 gauge galvanized steel channels. (8) Chain Hoist: To be cast iron pocket wheel drive with machine link hand chain for over 10' X 10' (3048mm x 3048mm) doors. (9) 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. (10) Rope Pull: To be 1/4" (6.35mm) polyester rope attached to bottom angle.