Frost King 10 in. to 16 in. Adjustable Heat and Air Wall Deflector enhances the efficiency of air flow throughout your home. Designed for use with central forced air systems, this deflector adjusts from 10 inches to 16 inches wide to fit your needs. Its heavy-duty construction includes powerful permanent-strength magnets that securely hold it in place over your vents. During the winter months, point the deflector down to improve heating, and in the summer, point it up to enhance cooling. For optimal air circulation, floor vent air should be directed away from windows or furniture. Model Number: HD9