16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size - Height_16in RG1612AL Product Details Size 14

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

High Quality – high quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

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+ Product Details Size - 25"w X 18"h is the size for the duct opening measurement only

16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size Height_16in RG1612AL Product Details Size 14 + Product Details Size 28"w X 20"h is the size for the duct opening measurement only Design – Unrestricted airflow for your HVAC system adjustable one way louver with full horizontal airflow directional control single deflection supply grill with 96% airflow noise free components no vibrating louvers etc