12"W X 10"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 11.75"H] Color_White Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 7 3/4" x 1"

+ Product Details Size – 36"w X 14"h is the size for the duct opening measurement only

if your hole is 20" wide by 14" tall

Universal Fit – Dimensions of 6-3/8" wide x 3-1/2" high x 3" deep make it compatible with most standard thermostat models

actual front end outer dimensions are 3"

12"W X 10"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 11.75"H] Color_White Actual Filter Size – 31+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are 13. 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