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Re: cleaning tower fan
The best way that I found to clean things like this is to find someone who has an air compressor and blow out the unit. But do this outside! The dust is usually unbearable. This is easier than losing small parts and can't hurt it at all!
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Ionizers generate ozone, that is the same smell that you would have near an electric motor or a copy machine. The smell is caused by electric sparks that occur during the ionization process. Essentially high voltage is applied to a grid, air passes over this grid and electrons jump off of it and into the air. They then attach to any particles that are present in the air and make those particles attractive to anything less charged than they are.
There is a limit to how much ozone an air ionizer is allowed to produce because ozone is a respiratory irritant and is not desirable to have in large amounts. Ozone also damages rubber. A commercial air purifier has to certify that it is in compliance with that law in order to be sold. The difference is that they can change characteristic based on how clean the grid is and how much humidity is present.
Any tower fan is something of a pain to dis-assemble. Lots of screws and tricky plastic parts that snap together in various ways. So I don't take anyting apart on the fan itself. I use an air compressor with a blower nozzle to get the job done. As you blow the fine stream of air over the vents and into various areas at the top and bottom, watch out for dust blowback. As you blow into the center vents/grille, the fan blade will spin around, too. After you've blown out the dust, use a damp rag, along with an old paint brush to clean out the grooves in the vents and grille.
The most likely cause it that your CPU is running hot, but it would be best to check the user guide you got with the PC or consult the DELL website, perhaps download a new copy.
It would be a good idea anyway to disconnect your tower, open it up and (Carefully) hoover / brush (I use a natural bristle paint brush about 1.5") out all the dust and fluff which has probably accumulated inside. Also all the ventilation slots, front, back and side.
In particular, in the fans (Power supply unit, CPU heat dispersal and tower inflow).
The CPU heat dispersal fan, may be covered with plastic ducting will be screwed (4 screws 1 in each corner) onto the top of a heat dispersal plate/grid. This plate is usually clipped in place, leave it alone. Take the fan off and clean out the plate.
cleaning the tower fan consists of this, i took the time to figure it out! unscrew top two screws on back of tower fan. then on bottom of tower fan is a screw cover,(pin size hole in middle of circle) pull cover off. unscrew hidden screw, and now with a little force it should pop right off. it exposes the filter and all it interior. front screen does not come off. oh yeah,your welcome!