Ceiling air diffuser

Material:Normally use 0.8mm to 1.0mm thick aluminum,or can up to customer`s requested.Color:Normally white.(other colors are also available)Advantages:1.Neat appearance2.Good quality3.Low and reasonable price4.Easy to install or remove the diffuser5.Suits for any place that used central air conditioning system,provide excellent ventilation effectSize:We can make it any size as customer requested.Describtion:This product is used for air-conditioning room with positive presure,it provide automatic air venting.Normally,the louver will be natural down to avoid and isolate the air exchange.When the air presure from indoor is less than from outside,air flow would open the louver blades and the air comes in,makes the air presure balance. But if the air presure from outside is less,then the blades keep down to isolate the air exchang.