This item was received from someone else. It is unused. Maintains indoor and outdoor air circulation. Suitable for extracting oil fumes and viewing the ventilation openings of ceiling turbine units and ducts. Practical, durable, and easy to install. Features include: keeping indoor air fresh, shielding, no obstructions, wind protection, rain protection, and mosquito protection. The structure is lightweight and easy to install, and can be used in places that directly exhaust range hoods. Specifications: Material: Plastic Size: 200 * 200 * 40mm Diameter: 6" / 150mm Package Includes: 1 X Plastic Air Vent Grill Cover Remarks: 1. Manual measurement, error of 1-3mm 2.