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"] Copper Coil-Insulated Line Set actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 14 5/8" height

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 16" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Actual Filter Size – 31 3/4"w x 13 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"] Copper Coil-Insulated Line Set actual front end outer dimensions+ 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