How to Choose the Correct Computer Dust Filter

Computer and electronics dust filters fit over the air intakes of your equipment, with a built-in magnetic frame. They are designed to fit onto computer cases, and need no special screws or skills to attach.

How Do Computer Dust Filters Work?

The air intake vents are the grills or ventilation holes in your computer's case, where cooling air enters. Some of these vents may have fans mounted behind them to direct the airflow in any specific direction, while others are unfanned.


To determine which vents are intakes, you can use a sheet of paper. With the computer or electronic unit switched on and running, loosely hold a sheet of thin paper in front of every vent opening or grill. If the sheet moves closer to the case, and gets sucked against it, then you’ll know that this vent is an intake vent, and needs to be filtered. Choose the filters that would best cover the openings.


However, dust can enter the case through a myriad of other openings - such as optical drives, USB and other ports. These are very hard to filter. The solution is to set up your system to be positive pressure, and to filter the intakes. In short, this means that more air must enter the case where it can be filtered, so that the higher pressure inside the case will leak out of every crack and port in the casing. This stops dust from entering there.


dust filters


How Do Filters Attach To Your Computer?

Computer air filters are fitted by a magnetic frame that is part of their structural design. The frame adheres directly to the case. If the case is non-ferrous (meaning it has no iron in its composition, so that a magnet is not attracted to it), we supply you with a peel-and-stick magnetic frame (optional extra) that fits onto your PC case around the air intake area.


Dust filters can attach to this frame, making them easy to remove and clean when necessary. The mesh used for filtering is a very durable high-precision medical grade mesh. 


How Do You Use Filters On Non-Ferrous Surfaces?


The extra magnets or ferrous tape that are supplied with the filters (optional extra) are for use on non-ferrous cases, such as those made of aluminium or acrylics.


Most distributors will include and send them as a unit, but make sure of this when you place your order.


When Fitting Filters, Avoid Doing These Things!

  • Fitting PC dust filters over exhaust vents.
  • Exposing PC dust filters to strong magnets, as this will demagnetize the built-in magnet or weaken it. Excessive heat will tend to do the same.
  • Do not bend the PC dust filter sharply, as this might cause creases in the mesh that will be difficult to remove.


Why not just stick the filter to the case? The reason is that dust filters are re-usable, and are designed to make cleaning of the filter as easy as possible. This operation could be more frequent than expected, depending on the filter’s location and conditions. 


Where Do You Use Dust Filters?


Although dust filters are mainly used for keeping dust out of computer equipment, they can be used to protect all your electronic devices from the ingress of dust and dirt. 


Electronic devices that need filters include:

  • Computers, UPS's and printers
  • Telecommunication devices and cabinets
  • Any size U-rack mounted modules and cabinets
  • Audio-visual devices and studio equipment
  • Projectors and cinema equipment
  • Home and professional sound equipment
  • Televisions and home entertainment devices
  • Satellite decoders
  • All industrial electronic equipment like CNC controllers, laser cutters/engravers, chillers etc.
  • All electronic laboratory equipment
  • Welding equipment like Inverters, Mig, Tig and laser equipment
  • Medical electronic equipment
  • Base station amplifiers and receivers
  • Household and workshop electronic devices and equipment
  • Many more...


How to Choose the Correct Filter


When choosing the filter which is best suited for your needs, there are a few categories to look at. These categories include:

  • Standard Filters - Filters designed to fit all standard-sized fans. Various sizes and shapes.
  • Square Filters - Filters that are square in shape.  Available in different sizes.
  • Rectangular Filters - Filters that are rectangular in shape. Available in different sizes.
  • Round Filters - Filters that are round in shape. Available in different sizes.
  • Custom Filters – These filters can be designed to fit your exact needs - any shape, colour or size.
  • All filters can be ordered in a variety of frame colours, with a choice between black or white filtering mesh.


What to Consider Before Choosing Your Filter

  1. Determine where the air intake vents on the unit are situated. All intake vents should be filtered.
  2. Measure the length and width of the air intake vents. The minimum frame size is 10mm. This has to do with the structural integrity of the filter. Sometimes it will be better to choose a bigger filter to make sure that all the holes around a fan are covered.
  3. Choose a dust filter from Computer Gadgets Online Shop that corresponds to your measurements, or you can This email address is being protected from spambots. You need JavaScript enabled to view it. the exact requirements if you require any custom-made filters.
  4. Determine if the area where the filter is needed is ferrous or non-ferrous. Ferrous cases contain iron, so magnets will stick to them. Non-ferrous cases are made of substances like aluminium and acrylics. Magnets will not hold onto these, so you will have to indicate "non-ferrous" from the dropdown list when you place an order.
  5. Filters come with an extra magnetic frame/ ferrous tape that must be peeled and stuck to the case around the intake vent that needs to be filtered. The filter will adhere to this magnetically.
  6. Install the free Filter Alarm software that can be downloaded. Keep an eye on the filters to determine how regularly they need cleaning. Set the alarm accordingly. 


Quick Guide on How to Choose and Purchase Your Filters

  1. Choose Shape
  2. Choose Size
  3. Choose Frame colour
  4. Choose Mesh colour 
  5. Choose Ferrous or Non-ferrous
  6. Click "Add to Cart" and follow the checkout process.