roof vent side open system system function introduction vent roof adopts staggered open window designadd air convection effect.Open window Angel is 30 .can by inside and ourside greenhouse climate differentmake different open Angelroof vent area can take greenhouse roof whole areas 20% . Side window adopts whole machinery transmission method,cooperation with roof window and reduce in greenhouse temperature,adopts eversion type or pull-push type side open window. roof vent and side window all adopts gear and rack transmission method,electric control.
