These filters are designed for high temperature processes and are used for supply and exhaust air purification. They are for example used in the range of drying ovens, sterilization equipment, hot gas venting etc. The pleated filter medium of these filters is fixed by glass fiber spacers. The filter medium is mounted between protective grills made ​​of stainless steel (1.4301) and protected against shedding by a glass-fibre nonwoven. The design allows operating temperatures up to 350 °C for HS-Makro F-HT. If necessary, these filters can also be supplied  ATEX compliant. HS-Makro F-HT are sealed with fiberglass and are therefore completely silicone free. A glassfibre cord serves as gasket.