... and good-looking shape, this square air diffuser is widely used in ceiling,side wall, sidewall, door, air conditioner application, in broadcast room, hospital ... manufacture the products as clients' request.Specification and Performances Table for Air Conditioner Grille:Neckpart Windspeed(m/s) 2 3 4 5 6 ... the square diffuser, their performances data are equivalent as well Air Conditioner Grille