ceiling square diffuser 1. extruded aluminum construction 2. used in return air and exhaust application 3. good quality Detailed Product Descriptionsquare aluminium diffuser, air diffuser, aluminum diffuser, air grille,ventilation, HVAC 1.Mannual closing. 2.Material Extrude Product...

ceiling square diffuser 1. extruded aluminum construction 2. used in return air and exhaust application 3. good quality ceiling square diffuser1. extruded aluminum construction 2. used in return air and exhaust application 3. good quality ...