4" Round Air Vent Supply Grille With Sponge Gasket And Mounting Frame - HVAC Vent Duct Register Cover [Outer Dimensions: 6"] d actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 36 5/8" height

With a 6" diameter for the duct opening measurement

Carefully packaged for protection during shipment

The grille features counter-sunk screw holes that prevent paint from peeling during installation

Design – Unrestricted airflow For Your HVAC system - noise free components - no vibrating louvers etc

4" Round Air Vent Supply Grille With Sponge Gasket And Mounting Frame - HVAC Vent Duct Register Cover [Outer Dimensions: 6"] d actual front end outer dimensions+ Product Details Size The listed 4" diameter refers specifically to the size of the duct opening. However, please note that the total outer dimensions of the grille measure 6" in diameter. Design Circular air supply valves designed to be used in low and medium pressure ventilation air conditioning systems, of up to 300m3 h. Adjustable airflow control by rotating the middle disk, the gap will expand and retract to meet perfect air supply needed.