DUCT TYPE VENTILATOR

摘要: PROBLEM TO BE SOLVED: To provide a safety duct type ventilator in which disconnection of an installed can be informed to user and the protected against damage. SOLUTION: The comprises means 15 for storing minimum r.p.m. N(n) at applying voltage V(n), 16 detecting abnormality duct, e.g. supply 4a or exhaust 3a, by comparing detected operational with stored r.p.m., 17 informing when detects abnormality. Since user, deterioration indoor environment due deficiency ventilation, cold draft increase unsmooth opening/closing door, generation whistling, cooling/heating energy loss dealt quickly.