The Filter-1 HWF, uses water like all Hydrotron models, to purify the air stream by a combination of by a combination of centrifugal force and the violent mixing of water and contaminated are. As the air stream passes the fixed baffles the particulate is separated. The HWF is most commonly used for aluminum, titanium, and other hazardous dusts as well heavy sparking applications. These units meet or exceed OSHA and NFPA standards for dust removal inside of a building. HWF models range in standard sizes from 500 to 15,000 CFM and in larger sizes for custom orders.