34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe + Product Details Size -

+ Product Details Size - 4"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 14" is the size for the duct opening measurement only

Looks Like It Was Just Waxed

+ Product Details Size - 12"w X 10"h X 2"d (for duct opening measurement only)

Rigid gauge built for durability and long life in mind

34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 26" Or 26" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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