Negative Pressure Ventilation : Mechanical forced ventilation technique using fans to develop artificial circulation to pull smoke and heat out of a structure by placing fans in windows, doors, or roof vents.
The City of Sand Springs, Fire Department, Fire Glossary, Sand Springs, Oklahoma, USA 2007. http://www.sandspringsok.org/ArchiveCenter/ViewFil e/Item/51, (FrDept - Amer) {475}