The ash vacuum cleaner is not recommended. After a few seconds, the filter sets to. The suction tends then to zero. A coating on the filter did not Besserung.Des Furthermore, despite steel container and Metallsaugschlauch, due to the paper filter, once a smoldering at the filter arise, even if only a small ember is drawn with. During normal operation of a furnace Every now and then, the overnight embers inside the ash layer halten.Ich have this product banished to the garden shed for foliage eyes.