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and squirrels
actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height
Actual Filter Size – 17 3/4"w x 17 3/4" x 1"
For a visual guide on how to measure your vent hole before ordering a grille
this thermostat guard is the perfect solution for safeguarding your temperature controls
12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black and squirrels+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 27. 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