... with safe net and fly net 3.with vents and lock Pictures: Features:1.Frame: Powder coate, d high ... Labyrinth vent to prevent dust coming in. 7.Door lock: Tri-lock. 8.Structure:Outer door and security door can ... separated or joined together. 9.Main functions: Open,close,lock,ventilate,insulate,allow sunlight in,preven insects,and good ... year’s experience and language skilled staffs. rv round corner door