10" X 10" [Duct Opening] 4-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] 12in diameter Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

+ Product Description Protect and secure your thermostat with this high-quality Clear Plastic Thermostat Guard

thanks to counter-sunk screw holes and included screws

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 12" duct openings

high-impact plastic

10" X 10" [Duct Opening] 4-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] 12in diameter Actual Filter Size – 11+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are 11. 75" width X 11. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a