8"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 19.75"H] Compatible with Duct 6" + Product Details Size –

+ Product Details Size – 3"w X 10"h or 10"w X 3"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 18"h X 2"d (for duct opening measurement only)

Locking Security System – Features a built-in eight-tumbler lock and a supplied key to prevent tampering and maintain consistent temperature settings

+ How To Measure An Access Panel Overall Size:

8"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 19.75"H] Compatible with Duct 6" + Product Details Size –+ Product Details Size 8"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 19. 75" height. Design Easy unrestricted airflow for your HVAC system 50 angled to provide maximum airflow. High Quality Solid stamped steel with counter sunk screw holes (screws included) and no sharp edges. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed.