28" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter Design – Rigid gauge ABS

Design – Rigid gauge ABS plastic

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

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

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

Commercial Grade Aluminum - Will Never Rust - Designed for Warehouses

28" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter Design – Rigid gauge ABS+ 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