28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter These grilles and registers give

These grilles and registers give you an extra measure of quality that are visible to your family members and house guests

Designed for both wall and ceiling applications

Secure Locking Mechanism – Features a permanently attached eight-tumbler lock with a supplied key for added security

actual front end outer dimensions are 19" Width X 11" Height

+ Product Details Outer dimensions: 15

28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter These grilles and registers give+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 18" OR 18" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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