The kitchen exhaust fan backflow preventer is an essential accessory for any range hood system. It prevents the of air, ensuring that your kitchen clean. Its sturdy construction and compatibility with various range hoods make it a versatile and reliable choice for enhancing your kitchen's ventilation. Features -Color:Black -Material:ABS -Size:21.00X18.50X6.00cm/8.25X7.27X2.36in -Prevention: hood exhaust vent cover and kitchen valve effectively prevent air from reentering your kitchen -Durable materials: constructed from durable materials, these parts are designed to withstand high temperatures and resist wear, ensuring performance -Simple installation: these range hood accessories are easy to install, requiring no professional assistance, which saves you -Broad compatibility: suitable for various range hood models, these parts can be used in both home kitchens and commercial establishments -Improved kitchen cleanliness: by preventing grease buildup, these components help keep your kitchen cleaner and protect your kitchen surfaces Package list: 1PC Range Hood Check Valve, 4PCS screw, 4PCS bolt, 1PC foam strip