square air diffuser,circular air diffuser,air conditioning diffuser, air outlet,air register,air grille,air louver,air vent Features:1) Versatile supply air diffuser for constant or variable air volume heating, cooling, or ventilating2)All- ... fingertip lever for air volume control8) Bright White finish 9) One(Two)(Three)(Four)-way air diffusion10) White powder-coating finish square air diffuser