The heated prefilter model iFiD Filter Backwash M1is a samplegasfilter which can flushbacked with an electronic solenoid valve. This valve can controll the pressure air (flushbackair) and the sample gas. The filter is very stable with the temperature level you preselect, and also in permanent use. In permanent use the maximum temperature is 200°C. The temperature is regulated in a range of +-1%.