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

Suitable for all AC applications

+ Product Details Size - 12"w X 30"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 14" OR 14" x 36" duct opening (measured at the opening)

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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