DEMCiflex FILTERS DEMCiflex Computer and Electronic Dust Fan filters are available in an array of choices and combinations that are divided into two main categories : Standard and Custom. Standard Filters are designed to correspond with all the standard fan sizes and is available in square/ rectangle or round. As trends in fan sizes change with time this range will be expanded. Custom filters on the other hand have case specific designs and can be made into any shape or size to fit your case exactly. These filters may also be branded with any graphics and logos. Any of the filters in both these categories may be ordered with either black or white filtering mesh and the filter frame in a wide range of colour and finishes.