Features: Crafted from thick steel, this wall vent Caps with a check Valves ensures durability and rusts resistance for long service Performances. Available in multiple size to fit various duct diameters, build in check Valves effectively prevents backflow of air, enhancing ventilation efficiency. Suitable for homeowner , constructions workers, and HVAC engineers, this product meets both professional and everyday needs. Perfect for use in kitchens and bathrooms, it facilitates smooth airflows in space requiring efficient ventilation. Enhances your home ventilation system with this robusts vent Caps , designs to maintain best air circulation and improve indoor air quality. Specifications: Material: steel Diameter: 75mm/110mm/160mm(optional) Package Includes: 1xWall Vent Caps note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.