34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 20 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 6" or 6" x 10" duct opening (measured at the opening)

Its professional design and solid construction make it the perfect solution for safeguarding your thermostat against unwanted access

Universal Fit – Dimensions of 6-3/8" wide x 3-1/2" high x 3" deep make it compatible with most standard thermostat models

34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d Actual Filter Size – 11+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 11. 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