Description: Air vents act as air ducts points of access that enable air to freely circulate to and from the HVAC (Heating, Ventilation, and Air Conditioning) system. Air ducts move through each room in the house to enable the HVAC to cycle air between the cooling system and the air inside the home. Air vents are the terminal valves that lead from the air ducts into the room. Modern cooling systems are designed with two or more air valves that can be categorized into supply vents and return vents. Supply vents deliver fresh cool air from the air duct into the rooms while return vents push air from the room into the duct for cooling in the HVAC system. Multiple air vents in a room are much more efficient than fewer air vents. The HVAC system functions best when all return vents are kept open to avoid air pressure build, which could put strain on the cooling system. Air vents are also important for saving energy costs and keeping rooms free of humidity.Purchase air vents from the largest selection available at MRO Supply. We stock a wide assortment of air vents to suit any application.