Before revision: Methods Mechanical fans can be used to provide positive pressure ventilation when used in tandem with either existing openings such as windows, skylights or heat/smoke vents on the roof; or by cutting new exhaust vents in the building.
After revision: Positive pressure fanMethods Mechanical fans can be used to provide positive pressure ventilation when used in tandem with either existing openings such as windows, skylights or heat/smoke vents on the roof; or by cutting new exhaust vents in the building.