Employers and employees today are concerned about the quality and safety of their work environment. In the office, the concern is for a proper supply of comfortable air, free of noxious or dangerous contaminants. In the plant the same concerns apply, plus the concern for the removal of toxic fumes. In some cases, like microprocessor fabrication, product quality itself depends on clean ambient air.
Modern hvac systems are designed to handle these demands. Older systems are being retrofitted to bring them up to current standards. Air movement in these new and retrofitted systems depends on an increased number of sensors coupled with computerized control.