swirl air diffuser,air grille,ceiling air grill,diffuser;air outlet; ... be vertically or horizontally connected.Inner packing: Specification: 300 x 8, 400 x 16, 500 x 24, 600/625 x 24 ... ,625 x 54, 825 x 72Outer packing: Specification: 300 x 8, 400 x 16, 500 x 24, 600/625 x 24 ... , 600 x 48,625 x 54, 825 x 72 fixed swirl air diffuser/ceiling air diffuser/ceiling grille/grill