EGF model gas filters  separates the dust particles carried by the gas or very small particles spread within the gas (for example: dust and rust), holds these and protects the burner, gas counter and adjustment devices which may possibly be damaged. Dust, woodchips, smut and other physical substances and dirt in the gas are held by the fiber. When the dust tank capacity is exceeded or a very high pressure difference effected, the filter loses its filter protection function. The Filters are resistant against the mechanical and thermal stress that occur under operational conditions. The device must be kept away from rain and water as much as possible.