26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak + Product Details Size –

+ Product Details Size – 25"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

Works for every air conditioning & refrigeration application including ductless mini-split

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

high-impact clear plastic

26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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 Made from