Frost King HD7 Heat and Air Deflector, 10 to 14 in L, 12-1/2 to 16 in W, Plastic, Clear

During the Winter, the curved air deflector directs warm air down for improved heating. In the Summer point the vents up to direct the air conditioning towards the ceiling for improved cooling. Plus you can easily cover up drafty vents with the Frost King magnetic vent covers.