2 Pack Air & Heat Deflector for Vents, Sidewalls and Ceiling Registers, Adjustable from 8.5"...

【DESIGN】Unique two part expandable design, made of High transparent unbreakable plastic. 【FEATURE】Fastens securely to metal duct surface with two (supplied) strong magnets. Redirects air for added room comfort and increased system efficiency, saving energy. 【INSTALLATION】Adjust the deflector to fit the vent and position magnets to keep the unit in place. ※ Try to press magnets(supplied) to bottom until it touch your vents, the magnets will hold down firmly. 【UNIVERSALITY】It's suitable for common 4x10 Inches, 4x12 Inches, 4x14 Inches, 6x10 Inches, 6x12 Inches, 6x14 Inches and the vents which length short than 16in or width more than 3.5in. 【WHERE TO USE】Widely Used for floor vents, sidewall, ceiling registers. And It can be used all around the home , office, work place, super market, etc. 【NOTE】The magnet included with this product is not suitable for air vents made of aluminum or plastic, nor for vents longer than 16 inches. The screw slots on the wind deflector are designed exclusively for non-metallic air vents. 【COMPATIBILITY】Works seamlessly with metal air vents via strong magnetic attachment. For wooden air vents, secure the deflector in place with screws (screws are not included in the package).