28" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter Tamper-Proof Design – Provides robust

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

14" Diameter Is The Size For The Duct Opening Measurement Only

Design – Rigid gauge ABS plastic

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black

28" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter Tamper-Proof Design – Provides robust+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 32" OR 32" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 31. 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