External filter attachment for a secondary air device and secondary air device with such an external filter attachment

摘要

External filter attachment for a secondary air device of an exhaust system of one or more fireplaces, the secondary air device having an air inlet opening for the inlet of secondary air into the exhaust system and a pendulum flap for opening and closing the air inlet opening, characterized in that the external filter attachment is a bag-shaped, in particular a cone-like bag-shaped, bag-shaped or is a can-shaped filter element which, in its intended arrangement, covers the secondary air device at least in the area of the air inlet opening without impairing the mobility of the pendulum flap to the outside, the filter element being at least largely made of an air-permeable textile filter material for filtering out dust / soot particles and means for attaching it to the secondary air device in the intended arrangement.