Makes all the difference, on the plane they may wonder what kind of poison gas you intend on filtering.as long as i dont say a thing, maybe it will go through without causing any problems in the xray... my Playstation 3 seems to be of the same complexity and they never said a thingg when i put it in my suitcase (always under the plane.)
It is a fart controller for your bathroom.Customs (At the Airport) probably won't have seen many Carbon Filters, In which case they will want to investigate which will mean you having to give them an explanation as to what it is. They will then probably want to take to filter apart to make sure there is nothing undesirable inside.
I doubt very much you will get it past an x-ray machine, in which case I would advise you post it.