Pressure at higher than atmospheric; used in SCBA facepieces and in pressurized stairwells to reduce entry of smoke or fumes through small openings. High volume, portable Positive Pressure Ventilation fans are now carried by fire departments and used to pressurize the fire building during interior attack to control smoke and heat ventilation at de...
Found on
http://en.wikipedia.org/wiki/Glossary_of_firefighting
Positive pressure is a pressure within a system that is greater than the environment that surrounds that system. Consequently if there is any leak from the positively pressured system it will egress into the surrounding environment. Use is also made of positive pressure to ensure there is no ingress of the environment into a supposed closed system...
Found on
http://en.wikipedia.org/wiki/Positive_pressure
pressure greater than that of the atmosphere.
Found on
http://www.encyclo.co.uk/local/21001
No exact match found.
