Usual practical methods of plants ventilation are: * Exhaust fans or Power Roof Ventilators (PRVs). To do a satisfactory job of eliminating excessively hot air, it is usually essential to have powered wall and/or roof exhausters. These fans should also help to control air pressure within the building whether it be negative or positive pressure. * Supply Fans or PRVs. Additional information can be found at the Industrial ACME Fan Company web site http://www.acmefan.net/index.html Oleg Tchechel nis@primus.ca http://www.acmefan.net/profile.html http://www.acmefan.net/resources.html
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