1PC PVC Exhaust Fan Check Valve Round Pipe Backdraft Damper 75/110mm Air Duct Ventilation Grill for Bathroom Kitchen Accessories _x000D_ _x000D_ Kitchen range hoods check valve for 150/160/180mm Pipe Double-ended anti odor check control air outlet fresh system _x000D_ _x000D_ 5 installation methods : _x000D_ Style A:Double-ended Connect PVC pipe with Outer diameter of 110mm _x000D_ Style B:One ended Outer diameter 110mm PVC pipe,One ended inner diameter 80mm or 100mm aluminum foil tube _x000D_ Style C: Double-ended Connect PVC pipe with Outer diameter of 75mm _x000D_ Style D: One ended Outer diameter 75mm PVC pipe,One ended inner diameter 80mm or 100mm aluminum foil tube _x000D_ Style E: Double-ended Connect aluminum foil tube with inner diameter of 80/100mm _x000D_ _x000D_ _x000D_ Note: _x000D_ Due to the difference between different monitors, the picture may not reflect the actual color of the item. _x000D_ Since the size of the product is manually measured, there is a slight 1-3cm error, please understand thank you. _x000D_ _x000D_ Package Contents:1x Flue Smoke control(No Other Accessories) _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_