22 and 23 show no significant difference between background level of ozone and a single device of the current invention running alone here even in a small room with no air circulation or ventilation no significant level of ozone accumulates with the current invention the sharper image air freshener model iu627jpn is used this compact device has the disadvantage that air inflow and outflow are on the same side there is thus mixing between the two air streams that reduces the efficiency of the device since the same air is repeatedly re processed it is converted into a uni directional flow device by cutting louvers into the rear side of the housing the louvers are 4 mm u00d7 30 mm at 2 mm spacing eleven such louvers are cut with a milling machine adjacent to the length of the internal high voltage wire catalyst fabricated according to the specifications of u s pat no 4 871 709 was nhc 423 from nikki universal tokyo japan in the form of blocks 109 mm u00d7 52 mm u00d7 10 mm thick and being made of ceramic fiber aggregate coated with mno 2 with 200 cells inch the clamshell as in fig7 was fabricated by 3d printing and the dimensions were such that the four corners of the catalyst were wedged into place prior to pressing the catalyst block in place the seal indicated by 102 in the figures was created by means of an o ring of ultra compressible silicone secured in place with dow corning 700 silicone sealant the seal indicated by 103 in the figures was created by application of the same sealant at the interface between the clamshell 101 and the body of the sharper image device the function of the device as an aerosol sampler was.