30" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 32 5/8" X 14 5/8"] 12" Round Duct Pipe Design – This airflow control 4 X 12 Is CRFG2028 Width_14in

Design – This airflow control component are made to connect to HVAC diffuser and restrict airflow

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 38 5/8" width X 26 5/8" height -

+ Product Details Size - 10"w X 10"h X 2"d (for duct opening measurement only)

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

30" X 12" Steel Return Air Filter Grille for 1" Filter Removable Frame * Filter Included * [Outer Dimensions: 32 5 8" X 14 5 8"] 12" Round Duct Pipe Design – This airflow control 4 X 12 Is CRFG2028 Width_14in Design – This airflow control component are made to connect to HVAC diffuser and restrict airflow + Product Details Size – 16" x 16" is the size for the duct opening measurement only