The spring tension shall be fully adjustable from outside of the end bracket plate. The springs are to be grease packed and anchored, using a cast iron anchor, to a cold rolled steel inner shaft. Safety factor allows for a safe operation, ease of use, and a longer spring life. Springs are to consist of helical torsion type designed to meet a 25 percent safety load factor.

The deflection shall be limited to a maximum of. The spring counterbalance is to be housed in a steel pipe of the appropriate diameter and wall thickness as to support the curtain.

The bottom bar shall be provided with a lift handle and slide bolts. The bottom bar shall consist of two steel factory painted angles a minimum ⅛ inch thick. Each curtain shall receive a bottom bar to maintain the slat alignment and posture. The Steel slats are to be hot dipped galvanized as per A.S.T.M. Slat thickness shall be calculated with U.S. Each end of alternate slats are to be assembled with galvanized steel end locks to maintain the slat alignment and to act as a wearing surface inside the door guides. The Curtain Model 750 consists of interlocking slats that are cold roll formed from hot dipped galvanized steel with an optional baked on gray polyester enamel coating or 304 stainless steel with a number 4 finish flat profile SF1.

FDCL-1000 Automatic Resetting Fire Door Operator.

tubular motors with or without automatic testing.

hand crank with or without automatic testing.

Fire shutter counter