... . 3.Glass: Grey,single glazing acrylic panel,UV resistance. 4.Security mesh:Aluminum alloy mesh. 5.Flyscreen:High strength fiberglass mesh ... prevent dust coming in. 7.Door lock: Tri-lock. 8.Structure:Outer door and security door can be separated or joined together ... . 9.Main functions: Open,close,lock,ventilate,insulate,allow ...