Mechanical ventilation systems in large commercial buildings are normally designed and operated to heat and cool the air, as well as to draw in and circulate outdoor air. On the other hand, ventilation systems themselves can be a source of indoor pollution and contribute to indoor air problems if they are poorly designed, operated, or maintained. They can sometimes spread harmful biological contaminants that have steadily multiplied in cooling towers, humidifiers, dehumidifiers, air conditioners, or inside surfaces of ventilation ducts. Ventilation systems are required around most compaction installations to collect and control the gases that are squeezed out during the compaction process, as well as any particulate matter that may be generated. The ventilation and treatment system typically consists of:

• A negative pressure enclosure to prevent leakage of potentially radioactive gas and particulate
• A Multiple Stage of Filtration with Pre Filter, Fine Filter and HEPA filtration system on the Supply or exhaust to remove particulate
• An activated charcoal absorber bed if certain radioactive gases, such as iodine, are present