No question, they are doing their job! Had to my old PC for years the same, only in silver color! The result could be seen ... no dust in case ... a lot of dust on the filter that could be easily removed from the outside with a vacuum cleaner! Do me now for my new body which ordered in black and installed. Since I already know the result, there is rightly 5 stars :) Oh yeah ... and at all temperature freaks ... because nothing ... got it changes compared) Tip for fixing: For me it was the rubber fan Enkopplung that lay at the Enermax fans there! And if you want to attach the air filter without a fan on the housing, you can simply turn the rubber fan Enkopplung and also fix it! So I've made it!