44"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 45.25"W x 5.25"H] 18" Diameter + Product Details Size -

+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 8"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening)

+ Product Details Size – 30"w X 10"h pleated MERV 8 filter for HVAC return filter grille - 3 Pack

Extra Strong – No more dragging around an uncomfortable bag to your jobs

44"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 45.25"W x 5.25"H] 18" Diameter + Product Details Size -+ Product Details Size 44"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 45. 25" Width X 5. 25" Height. Design Designed for concealed, flush placement on your wall with a 3 8 inch space between louvers, this linear grille comes with an installation frame and clips for easy hook in assembly, ensuring a refined and seamless look. High Quality Aluminum The premium durable aluminum will never rust and it will never