Compared with the supplied filters original they are significantly thinner and more airy. What per se not indeed must be bad, the air flow is definitely better. But apparently, the filters also have a sound insulation function: with these replacement filters are my fans much louder than the original filters. The filter characteristics I can not say anything yet. But again I will not buy me out noise reasons.
Update 02/04/2014: I have the filter for 2 months now in use. The bathroom has become dirtier compared to before the original filters significantly dusty /. Now I have looked at today the filter in the bathroom: it still looks like new. Therefore, I can only conclude that he is with me its purpose is not fulfilled and unusable. I'm going to again order the original filter and dispose of them.
