Model 1108 Curtain Lock is specifically designed to prevent divider curtains from falling in the event of a failure of the drive motor • Instead of a strap that reels in and out that locks on an over-speed condition similar to the model 1100 Safe Strap, the Curtain Lock mounts directly to the divider curtain drive shaft • When the drive shaft experiences an over-speed condition, the Curtain Lock will immediately lock and prevent the curtain from falling • The 2 3/8” O.D. drive pipe is slid through the Curtain Lock rotating member and secured using a ½” diameter bolt • The Curtain Lock housing is attached to the curtain supporting structure with a bracket to prevent the housing from turning • Maximum hanging curtain weight shall be 800 lbs • Curtain Lock shall be designed to lock in either direction to allow for flexibility in installation • Compatible with curtain models 4020, 4020R, 4025, 4030, 4040XL, and 4050.