CENTRALIZED EXHAUST SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a centralized exhaust system which has a centralized exhaust fan for exhausting air from individual exhaust fans en bloc, without limiting those working exhaust fans. SOLUTION: The operating condition of exhaust fans is determined to determine a required air flow rate of a concentrated exhaust fan according to measured values provided by current sensors for measuring the currents of the exhaust fans.