Suction type ventilation fan unit with inverting ventilation fan

摘要

The present invention aims at providing a ventilation fan device capable of obtaining a desired air volume as a suction type ventilation fan device. The present invention relates to a ventilation fan device having an air flow path including a duct for leading indoor air outdoors and a ventilation fan arranged in the air flow passage, wherein the ventilation fan is arranged in a direction And an inverting type ventilation fan disposed in the outdoor air circulation passage and reversely rotating the facing rotary vane. The ventilation fan is disposed at an outdoor side end portion of the air circulation passage, and sucks indoor air and discharges the indoor air.