16"w X 16"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 17.125" X 17.125"] Color_Red Oak + Product Details Size -

+ Product Details Size - 34"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 12"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 22 5/8" width X 22 5/8" height

[Outer Dimensions: 38

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

16"w X 16"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 17.125" X 17.125"] Color_Red Oak + Product Details Size -+ Product Details Size 16"w X 16"h Is The Size For The Duct Opening Only, Dimensions With Outer End are 17. 125" X 17. 125". Design Re configurable Interchangeable Sections Easily convertible into 1 Way, 2 Way, 3 Way, or 4 Way Just lift sections and rotate to re configure direction. 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