Secondary filters/fine filters are installed when the space for installation is limited. These low depth and light weight filters are available EN 779 classification which ranges F6, F7 and F8. These display low resistance which means low energy consumption.

Due to their light weight and low depth, these prove to be very economic to ship and store in comparison to other bulk filters. These are suitable to be used in various air volume systems and can withstand repeated fan shut down and turbulent air flow. These show a high resistance towards intermittent exposure to water providing high relative humidity resistance. These products are also available in bio static treated media.