Ideal for bulk collection, the CFM 3707-10 and 3907-18 feature a 46-gallon tank capacity. For increased capacity, a 110-gallon hopper system is available. The oversized filter area and the large collection capacities guarantee long periods of operation without stoppage. An electro-mechanical reverse-purge mechanism is available for fine power applications. Options include a stainless steel container, filter chamber, and carriage.