1. put the ion generator very near the air outlet 2. make sure there is no cover before the ion head, as a result of ions fly solely immediately when it change into released, and then would be adhere through nice particles in the air. to make it reside longer time, do not conceal something before it. 3. if you want lattice window before it, make sure the head is within the middle of the window rather than barrier. size:54 x 40mm Material:plastic colour:black Package Contents: 1 x Plasma generator Only the above equipment content, other merchandise usually are not included. Note: Light capturing and various displays may cause the color of the object in the photograph a little bit different from the real thing. The size allowed error is +/- 1-3cm.