One of the main causes of hardware unreliability is heat, and the biggest cause of gradual increase in running temperature is the accumulation of dust. As dust builds up around sensitive components inside the case, cooling is reduced, fan noise increases and the system could start to slow down. Dust can even be slightly conductive and this, combined with a hotter running temperature, may eventually cause hardware failure. Of course, the best solution is to prevent dust entering your system in the first place, and so we are pleased to present these magnetic computer dust filters which will keep dust and dirt out of your IT equipment. Your PC will run cooler and will last longer, saving you money and making maintenance and any future upgrades of your computer much more pleasurable. This is definitely a case of prevention is better than cure! Even if your PC doesn't have a fan installed in a certain position, but there is still a grille opening to allow airflow and possible later installation of a fan, it is still worth considering adding a filter to the open grille. The reason for this is because there will still be a likelihood that air (and therefore dust) will be entering the PC case at that point. This airflow will be caused by negative pressure inside the PC case which is brought about by other fans in the PC, such as the power supply fan and even the processor fan, which all serve to move and ultimately expel air from the case. High Precision Polyester Mesh Dust is prevented from entering the PC by a high precision polyester mesh. This super fine medical-grade mesh is the same material which is used in hospitals use to keep dust out of operating theatres. The filament diameters of this mesh are smaller than the openings between them. This allows more air through the filter while still stopping the dust. These filters are the only computer dust filters we have come across that guarantee to keep out specific size and larger dust particles due to their mesh openings being very accurate. Easily Cleaned Because the filter mesh is black, it is easy to see when the filter needs cleaning. When there is an accumulation of dust and debris on the filter, remove it from the case by hand and brush the debris off by hand or with a soft brush. For a more thorough clean, simply put the filter on a flat area and using a toothbrush and soapy water, gently scrub it. The filter should soon be as good as new again. MAKE SURE TO DRY THE FILTER THOROUGHLY BEFORE REFITTING IT! Attach Using Magnets or an Adhesive Frame The filters are fitted over the fan intake or vent holes on your computer case using magnetic strips built into the filter. If the case is non-metallic, a lightweight and flexible adhesive frame (available separately) can be fitted to the case and then the filter can be fitted onto it. This will extend the lifespan of the computer and lead to less downtime and an overall more enjoyable computer experience. You can even attach the filter directly to a fan if required: just attach the adhesive frame to the fan and then the filter to the frame - simple! Available Filters As you can see, there are four different sizes of filter available. Most recent PC cases use 120mm fans while some older cases will use 80mm. If your case happens to use 92mm case fans then choose the 120mm filter. The 140mm filter is obviously used for very large fans. Many cases are now supplied with air intakes on the side panel of the case which are sometimes larger than 120mm fans. The 40mm filter is designed to work with AV or home theatre equipment where there are two 40mm fans installed adjacent to each other.