The filter unit consists of one pre-
chamber, where the most dusts are
sorted out, falling then in the first col-
lecting bin. The following labyrinth
together with the high efficiency filte-
ring cartridges and the second collec-
ting bin complete the filtration of the
remaining dusts.
The high performance fan, placed just
on the top of the unit, assures a high
suction capacity and a low noise level.