The system has a tangential air inlet containing the material to recover.
The air enters the perforated cone, which also contains a tapered worm screw
The material to recover is pressed against the reed valve which opposes such a resistance to allow its compacting. The transport air exits the perforated cone and is then taken again to undergo a second and finer treatment, for the purpose of recovering the dusty, airborne material.
On reaching the desired level, the valve opens and releases the material in a container.