invisible window screen

A: Front face ajudtive devicesThe left side adjustor of our product is for adjusting the spring elastic power of the window screen , while the right side adjustor is for adjusting the resisting power of the resisitance device.1. To adjust the spring It has completely and enfectively overcome the phenomenon that the screen net can not be taken back when the spring is soft after an over long time using. It can adjust the moving speed of the pulling girder of the window screen. It can adjust the spring from the front face which can not be reached by the side face adjustor leaning with other objects when the screen box is installed. 2. To adjust the resistance power deviceIt can adjusst the resistance power and control the moving speed of window screen so that when taking back the pulling girder , no big noise can be made out.B Inner Adelomorphic Bead Type Windproof Device The bead is adelomorphic in the inside part of the window slot, which can avoid eight degree wind. When suffering fro
invisible window screen