... Greenhouse, Cow barns, Sheep pens,etc Film Rolling Machine We supply manual film roll up machine, film rolling system, ventilation equipment.Feature:Used ... ventilation system on sides or on roof manually in poly film greenhouse. FunctionMax.Roll-up LengthMax.Roll-upHeightMax.TorqueWarrantyRoof & Side open100m1 ... N.m3 yearsFor Plastic Greenhouse, Cow barns, Sheep pens,etc Film Rolling Machine