We are offering sliding doors. Vvs 4000 is an operating unit specially designed for sliding doors, which weighs up to 4000kgs. The excellent design of this drive enable it to withstand over heat even on frequent use and is tropicalized. The air and oil cooling system insure easy maintenance. The attached gear box is made of aluminum injection casting and the yellow crown gear from gcusn 12 bronze. This operating unit is equipped with an adjustable clutch to protect the control system.