The Pure Air Filtration PureAir DS is a vent control system that is completely self contained. This system provides a reasonable inexpensive air purification system for small flow odor air streams ranging in volume without prefiltering or mist/grease elimination, 50 to 1000 CFM. The PureAir DS systems maybe connected to an exhaust vent and used for passive odor control or environmental emission applications. The most common applications are process vessels, storage tanks, sewage life stations, and package sewage treatment plants. Drum scrubbers do not include prefilters, final filters, or mist/grease eliminators. Larger systems will include a blower to ensure active purging of contaminants.