28" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille Incorporated with Integral Butterfly Damper

Incorporated with Integral Butterfly Damper for full Airflow Control

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

Actual Filter Size – 11 3/4"w x 7 3/4" x 1"

including Ductless Mini-Split

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

28" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille Incorporated with Integral Butterfly Damper+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 22" OR 22" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 21. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum