12" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 6"h is the size for the duct opening measurement only

Design – Unrestricted airflow For Your HVAC system - noise free components - no vibrating louvers etc

+ Product Details Size – 6"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 4"h is the size for the duct opening measurement only

Pressure Rating: 2100 to 7000 PSI

12" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 6"h is the size for the duct opening measurement only Design – Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc