4" Circular Round Plastic HVAC Supply Grille Air Diffuser -Vent Duct Cover [Outer Dimensions: 6"] Powder-Coated By simply measuring the width

By simply measuring the width or the length of the vent

actual front end outer dimensions are approximately 25

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

Easy Installation: Comes with mounting screws for a secure fit in minutes

Ring Base Design – Allows for easy installation without removing the thermostat

4" Circular Round Plastic HVAC Supply Grille Air Diffuser -Vent Duct Cover [Outer Dimensions: 6"] Powder-Coated By simply measuring the width+ Product Details Size 4" Diameter is the size for the duct opening measurement only, actual front end outer dimensions are 6" diameter. Design Made of strong durable ABS plastic, will last forever & never rust. Easy removal for cleaning. Airflow Improved airflow dynamics long neck bBody reduced noise design integrated spring fasteners. Easy Installation Just pop the diffuser right into the wall duct hole and the side springs will hold it right into