Thermwell 10" Magnetic Vent Heat Deflector for efficient temperature control. Crafted from clear plastic, this deflector seamlessly adapts to your central forced air system. During the winter, it directs warm air downwards for enhanced heating, while in the summer, it redirects cool air upwards for improved cooling. Its easy installation and compatibility with vents ranging from 10" to 14" make it a convenient choice for year-round comfort.