The YCS Flex Foam Vent Cover is designed to make sealing crawlspace vents quick and easy. No more cutting rigid foam board on the job, leaving a mess in the customer's yard. Our YCS Flex Foam Vent covers friction fit into most standard 8″ x 16″ openings and can be easily trimmed. Once the cover is in place, simply apply a small bead of the YCS Magic Adhesive around the edges to seal.