Yeah, I agree. I generally recommend inspecting PC case interiors monthly, and clean as necessary - which in my house (with Hank - the dog, and grandkids in and out stirring up dust and dog hair) that means about every 6 months I have to lug my systems outside to blast them out with my air compressor. Before I replaced all my cases with new ones that have removable, washable air filters, it was a 4 or 5 times a year chore - at least with my systems that run 24/7.