This adjustable wall register air deflector redirects and channels airflow as it leaves a heating/cooling vent for added comfort, saving energy. Strong metal magnets are attached to the air deflector for instant mounting on your heating/cooling register. There are also molded in screw slots for attaching the deflector to the register using screws for a more secure mount. The clear deflector adjusts from 10 inches to 16 inches wide and is 5-1/2 inches high. The deflector is made of clear polycarbonate with a melting temperature of approximately 325 degrees Fahrenheit. It should only be used with registers for central forced air heating and air conditioning.