12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 1-Way + Product Description Enhance your 4 X 12 Is CRFG2028 Width_14in

+ Product Description Enhance your HVAC system with our premium Aluminum Double Deflection Adjustable Air Supply Diffuser

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

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

this model ensures top-notch air quality

12" x 12" Corner Direction Extruded Aluminum Ceiling Diffuser Square HVAC Vent Cover 1 Way + Product Description Enhance your 4 X 12 Is CRFG2028 Width_14in + Product Description Enhance your HVAC system with our premium Aluminum Double Deflection Adjustable Air Supply Diffuser actual front end outer dimensions are approximately 36 5 8" width X 10 5 8" height