20" X 4" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Color_White + Product Details Size –

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

Actual Filter Size – 17 3/4"w x 11 3/4" x 1"

+ Product Details Size - 26"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 16 5/8" height

providing a stylish and practical solution for ventilation

20" X 4" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Color_White + Product Details Size –+ Product Details Outer dimensions: 21. 75"W x 5. 75"H fits a 20" X 4" 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 supply