30" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only

it seamlessly blends with any decor while performing its vital role in your HVAC system

Copper coil line set fits most ductless mini split air conditioners

+ Product Details Size - 12"w X 12"h X 2"d (for duct opening measurement only)

easy unrestricted airflow

30" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only it seamlessly blends with any decor while performing its vital role in your HVAC system