Portable blower fan assembly

A surface drying method, comprising:

• positioning a portable blower fan assembly at a worksite, wherein the portable blower fan assembly is configured to provide airflow toward a wet surface, wherein the portable blower fan assembly comprises:
• a housing comprising:
• a first air tunnel comprising a first intake portion and a first exhaust portion, wherein the housing comprises a first pair of focus corners, wherein each focus corner in the first pair of focus corners is a portion of the housing comprising a respective curved or sloped surface configured to reduce a pressure at a base of the housing, the first pair of focus corners configured to provide a first airflow path that exits the housing in a downward direction from the first intake portion to the first exhaust portion of the first air tunnel;
• a second air tunnel comprising a second intake portion and a second exhaust portion, wherein the housing comprises a second pair of focus corners, wherein each focus corner in the second pair of focus corners is a portion of the housing comprising a respective curved or sloped surface configured to reduce the pressure at the base of the housing, the second pair of focus corners configured to provide a second airflow path that exits the housing in the downward direction from the second intake portion to the second exhaust portion of the second air tunnel;
• and
• a plurality of channels, wherein each one of the plurality of channels comprises an opening that extends from an intake side of the housing to an exhaust side of the housing, wherein an interface is associated with the opening of each one of the plurality of channels and configured to mate with a secondary interface of a plurality of channels of a second portable blower fan device in a stacked configuration,
• wherein in the stacked configuration, the exhaust side of the housing faces the intake side of the second portable blower fan device;
• a first fan assembly disposed between the first intake portion and the first exhaust portion of the first air tunnel, wherein the first fan assembly comprises a first fan blade and a first motor;
• and
• a second fan assembly disposed between the second intake portion and the second exhaust portion of the second air tunnel, wherein the second fan assembly comprises a second fan blade and a second motor;
• activating the portable blower fan assembly for a period of time;
• and
• deactivating the portable blower fan assembly after the period of time has elapsed.