mha@batcomputer.tn.cornell.edu (Mark H. Anbinder) (04/09/89)
I just bought a fan at Radio Shack to mount on top of my monitor to draw air through and keep the poor thing a bit cooler. The salesman said it would be appropriate for that, but in fact it causes a definite shimmer or wobble on the screen when it's on. This is understandable, of course, since there IS, after all, a magnetic motor in the fan. My question is, what could I do to shield the monitor from the magnetic field and still have the cooling work? Would a metal grille under the fan help? Should I put a cylinder between the monitor and the fan, holding the fan up a few inches? The fan is a 120VAC fan, rotating at 3100 rpm and with a 32 cubic ft/min airflow. The monitor is an Apple hi-res RGB. The fan actually does a VERY good job of keeping the monitor cool. If I don't manage to solve this problem directly, I may just let the fan sit there, and turn it on only when I step away from the computer. Could this fan damage the monitor in any way? How is Apple's internal Mac II fan shielded? -- Mark H. Anbinder ** MHA@TCGould.tn.cornell.edu NG33 MVR Hall, Media Services Dept. ** THCY@CRNLVAX5.BITNET Cornell University H: (607) 257-7587 ******** Ithaca, NY 14853 W: (607) 255-1566 ******* Ego ipse custodies custudio
mha@batcomputer.tn.cornell.edu (Mark H. Anbinder) (04/10/89)
In article <7699@batcomputer.tn.cornell.edu> I wrote: >I just bought a fan at Radio Shack to mount on top of my monitor to draw >air through and keep the poor thing a bit cooler. The salesman said it >would be appropriate for that, but in fact it causes a definite shimmer >or wobble on the screen when it's on. This is understandable, of course, >since there IS, after all, a magnetic motor in the fan. > >My question is, what could I do to shield the monitor from the magnetic >field and still have the cooling work? ... I have ended up using a cylinder to separate the fan from the top of the monitor physically. Actually, it's TWO cardboard cylinders, around four inches in diameter, one on top of the other. They are from institutional toilet-paper rolls (a friend got them from one of Cornell's dorm rest rooms). The cylinders sit on top of the monitor, and the fan perches on top of them. The fit is quite good, and since there is virtually no open space, the air draw is still fine. The fan keeps pulling air through the monitor and sending it upwards, and after it's been on for a few minutes, that air gets noticeably cooler. After several hours, there's still only-slightly-warm air blowing out the top, which means my concerns are no more! Thanks to those who offered advice on how to handle the situation. -- Mark H. Anbinder ** MHA@TCGould.tn.cornell.edu NG33 MVR Hall, Media Services Dept. ** THCY@CRNLVAX5.BITNET Cornell University H: (607) 257-7587 ******** Ithaca, NY 14853 W: (607) 255-1566 ******* Ego ipse custodies custudio