PURPOSE: To effectively recover heat of exhaust air and make it possible to supply hot air flows to a unit having a plurality of functions from a single device by connecting a single hot air flow generator to a plurality of kinds of hot air using function units.

CONSTITUTION: A single hot air generator 4 is connected to a plurality of kinds of hot air using function units A by a duct 7 so that fresh air is supplied from the hot air generator for heat-exchanging fresh air from the external part with indoor exhaust air to a plurality of kinds of hot air using function units A such as a tableware drier, a drier for a dishcloth and the like, various kinds of space heaters, etc. by means a duct 7. Hot air which is fresh is ejected through a hot air ejecting port 6 of the each hot air using function unit A. On the other hand, the indoor exhaust air enters the heat exchange part 1 of the hot air generator 4, wherein the exhaust air is heat-exchanged with fresh air from the external part and exhausted out of the house from the exhaust pipe 10. Consequently, it is possible to supply fresh hot air to various hot air using function units.