Bakuma Industrial RE-100J-BK Natural Air Supply Resin Square Register Black for Wall Mount, Manufacturer: Bakuma Industry, Note: Perfect for use with standard and natural air supply only. Features: Includes a manual opening and closing shutter that can be adjusted multiple stages to adjust the air flow. ■ The panel can be removed with one touch, making cleaning and replacing filters a breeze. ■ It has a neat square panel type design that matches any interior. ■All models come with an air tight seal (for preventing gaps in the duct).