Replacement Vent Inserts, No Frame: Envisivent Removable Flush Mount Air Supply, 10” x 4” (Duct Opening)/Requires 11" x 5" Drywall OpeningDescription A replacement vent cover insert for CB5002. *To ensure you select the correct Envisivent product size, be sure to review our Sizing Guide in our Resource section. Key Features 13 rectangular straight vertical slots Over 9. 8 square inches (63. 5 square cm) of open vent area 4 magnetic tabs on the vent cover for easy removal Moisture, mold, and water resistant Primed and ready to paint Eco friendly manufacturing and non hazardous Vent Cover