28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated Its locking eight-tumbler mechanism and

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 26" or 26" x 6" duct opening (measured at the opening)

actual front end outer dimensions are approximately 27 5/8" width X 38 5/8" height

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

28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated Its locking eight-tumbler mechanism and+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 26" OR 26" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 25. 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