Steel Slat Curtain: All slats are manufactured from the highest quality galvanized steel with a baked enamel prime finish. Available in 24 ga., 22 ga., 20 ga., or 18 ga.,. Available in Flat or Curved. (18 ga. in Curved only).
Drum Assembly. The counter balancing mechanism is housed in this unique, roll-up assembly.
Guides: Minimum 3/16A,A" structural steel angle. (Roll formed guides on 24 gauge doors up to 14A,A'0 x 14A,A'0.)
Bottom Bar: Two 2A,A" x 2A,A" x 1/8A,A" thick structural steel angles form a rugged bottom bar assembly. A rubber bottom astragal helps to conform to floor irregularities and helps guard against weather, dirt, insects and rodents.
Pipe Barrel: Continuous 6A,A" minimum diameter pipe to support curtain with no more than .03A,A" of deflection per foot of width.
Counterbalance: Helical torsion springs are oil tempered and grease packed. Springing is accurately calculated for every door using PorveneA,A's uniquely designed A,A"Door DynamometerA,A".
Door Stops: Stops are located on the inside and outside of the guides for added safety.
Sealed Ball Bearings: Self-aligning and allow free rotation of barrel.
Chain Hoist: Heavy duty #50 roller chain and sprockets combined with a smooth hand-chain provides for safe and efficient operation. Removal of chain hoist makes door Electric Operation ready without further modification or cost.
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