28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille w34h34 powder-coated finish adds a touch

powder-coated finish adds a touch of elegance while also being scratch-resistant

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

Actual Filter Size – 11 3/4"w x 21 3/4" x 1"

Universal Fit – Measures 6" wide x 3-1-13/16" high x 3-1/8" deep

As The Hot Air Will Flow Up & Out

28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille w34h34 powder-coated finish adds a touch+ Product Details Size 28" x 36" or 36" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 37. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing