28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 25 3/4" x 1"

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

Operating from -40°F to +248°F

complete with a supplied key

Actual Filter Size – 7 3/4"w x 25 3/4" x 1"

28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 Actual Filter Size – 11+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 30" OR 30" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 29. 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