Positive Pressurisation Units

The Windsor Filtration Australia-Purafil Positive Pressurisation Unit (PPU) is a self-contained, air cleaning system, designed to provide pressurisation air, free of corrosive gases. The PPU is recommended for controlled environments containing sensitive computer electronics and electrical equipment. Designed to stand alone, it can also be used in conjunction with Windsor-Purafil’s Corrosive-Air System when recirculation is also required.

Key application areas for the PPU are computer rooms, control rooms, motor control centres, and electrical equipment rooms in industrial environments, such as pulp and paper mills, geothermal power stations, waste water treatment plant MCC rooms, laboratories, and buildings such as libraries, museums, archives, hospitals and public service.

Contaminant-Free Air

The Positive Pressurization Unit supplies pressurization air, free of contaminant gases, to a controlled environment. The level of air cleanliness meets or exceeds established industry standards, such as the International Society of Automation’s ISA-S71.04. This standard conforms with the warranty requirements of most computer and instrument manufacturers.

Targets Specific Gases

The PPU is configured with two separate passes of chemical filtration media. This allows a user to choose the media whose performance characteristics are particularly suited for targeted contaminant gases. Purafil manufactures a full line of media, each of which are uniquely effective against specific gases.

Self Contained Pressurisation System

The PPU is designed to maintain continuous positive pressure within the room space. For normal operation, up to 50% of the PPU’s air handling capacity can be dedicated to introducing outside pressurisation air, while the other 50% or greater can be used for recirculation. In special cases a greater ratio of outside pressurising air to recirc air can be provided simply by adjusting the air ration damper on the side.
The PPU is an in-room housing containing a VSD controlled blower, particulate and gaseous filtration, gage units, and a field adjustable damper. The PPU is designed to work in tandem with standard packaged air handling equipment. Optional equipment is fast closing inlet damper ( for fire suppression systems ), inlet ducting and an air measuring station.