32" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter + Product Details Size –

+ Product Details Size – 28"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 18"h is the size for the duct opening measurement only

+ How To Measure A Grille

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

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

32" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 34" Or 34" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 33. 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