Actual Filter Size – 17 3/4"w x 15 3/4" x 1"
+ Product Details Size - 14"w X 28"h X 2"d (for duct opening measurement only)
Installs Directly On Round & Oval Spiral Duct - No Frames
+ Product Details Size – 10" x 26" or 26" x 10" is the size for the duct opening measurement only
and sound level range of NC 25 to 35
20"w X 20"h Extruded Aluminum Adjustable Surface Mount Supply Ceiling HVAC Air Grille Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 21.125" X 21.125"] Insulated Line Actual Filter Size – 17+ Product Details Size 20"w X 20"h Is The Size For The Duct Opening Only, Dimensions With Outer End are 21. 125" X 21. 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
