18" X 12" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White 12in diameter For added protection

For added protection

Tamper-Proof Locking Mechanism – Includes an eight-tumbler lock with a supplied key to prevent unauthorized access

Actual Filter Size – 29 3/4"w x 5 3/4" x 1"

+ Product Details Size - 16"w X 28"h is the size for the duct opening measurement only

18" X 12" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White 12in diameter For added protection+ Product Details Outer dimensions: 19. 75"W x 13. 75"H fits a 18" X 12" duct opening Durable stamped steel construction ensures long lasting performance Designed for sidewall and ceiling installation with included screws Multi shutter damper with easy lever for precise airflow control Smooth powder coated white finish for a sleek look and scratch resistance + Product Description Maximize your homes airflow with this premium Air Supply Grille air