18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 36"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 36 5/8" height

Superior Airflow Control: Built-in damper lets you control how much air enters your room

+ Product Details Size – 14"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 36"w X 16"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 27 5 8" width X 36 5 8" height