The window air inlets is made of high quality ABS. Designed for installation in the windows of PVC, wood and aluminum. Extremely easy installation of the air inlets provides tabs that allow you to install a air inlets without using screws. The diffuser window TipVent can manually opening and closing the two dampers which allows precise control of the inflow of fresh air from outside. The slender construction of the air inlets makes it less visible after installation.