So I was recently out like 100$ to ship my 27" imac to a certified repair center because the graphics card was totaled. The technician did not specify but my suspicions was that dust was the cause. So I am wondering, is there any type of snap on dust filter systems for the imac? I am basically thinking of those things they sell for regular box pc's that you put over the vents to prevent dust buildup and can be cleaned every few months. I could had swore I saw something like this on newegg, but cant find a trace of it now.