AC DraftShields CA1414 Central A-C Vent Cover 14 x 14 in. Our central air conditioning vent and grille covers are plastic caps that seal the AC ductwork during the winter heating season. By sealing your ducts you can save energy, lower your energy bills, and improve the comfort of your home. Available in 6 sizes to fit most any vent, the covers are clear plastic with rubber gaskets that secure in seconds and provide an air tight seal. Durable and reusable, they will last many, many years. Replacement gaskets available. Discounted shipping available for multiple items.