32" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper the gap will expand and

the gap will expand and retract to meet perfect air supply needed

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening)

Suitable for all AC applications

also referred to as T-Bar or Lay-in system

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height

32" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper the gap will expand and+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 18" OR 18" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 17. 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