4" Round Return Air Vent Grille With Sponge Gasket And Mounting Frame - HVAC Vent Duct Register Cover [Outer Dimensions: 6"] w18h18 + Product Description When it's

+ Product Description When it's time to upgrade your HVAC Vents in your house

you have 16 different varieties to choose from

All of these grills have dampers

Plain Ends - Gives you the freedom to cut and flare at your own project needs

Suitable for all AC applications

4" Round Return Air Vent Grille With Sponge Gasket And Mounting Frame - HVAC Vent Duct Register Cover [Outer Dimensions: 6"] w18h18 + Product Description When it's+ 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 return 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. Mounted