• For TOP-OPENING FLAP DOOR used with piano, butt or concealed hinges. • Opening angle 70° or 105°. • NSDX-20 is designed to hold door in fully opened position. • Speed adjustment screw located on front for easy adjustment. • Torque Calculation : Torque = Door Height × 1/2 × Door Weight Per Piece : 20~70 kg·cm (19~60 lbs·inch) Per Pair : 40~140 kg·cm (38~120 lbs·inch)
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