20" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 actual front end outer dimensions Compatible with Duct 4" Product Details Size 32 LO246

actual front end outer dimensions are approximately 37

actual front end outer dimensions are approximately 14 5/8" width X 22 5/8" height

High Quality – High-quality rust-free

+ Product Details Size – 8"w X 12"h is the size for the duct opening measurement only

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

20" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 actual front end outer dimensions Compatible with Duct 4" Product Details Size 32 LO246 actual front end outer dimensions are approximately 37 actual front end outer dimensions are approximately 14 5 8" width X 22 5 8" height