As a first aid for the flooded houses, drying was performed by using a blower to ventilate the underfloor and agitate the underfloor air. Afterward, the effectiveness of the blower was examined by measuring the effective ventilation rate and water content. The temperature and humidity, the concentration of suspended fungi, the number of attached fungi, and the concentration of dust were measured to investigate the underfloor environment. As a result, it was suggested that the use of a blower for first aid was effective and could inhibit the increase in mold.
