Heat exchange ventilation fan

The ventilation which exhausts the air to which the interior of a room became dirty, and puts in the fresh open air indoors is sanitarily required.
However, the warmed indoor air is taken out outside by ventilation and heat loses by it.
This heat exchange ventilation fan is a ventilation fan which reduced the loss of such heat as much as possible.

A heat exchange element uses the "heat" which special processing paper has, and the character which lets "humidity" pass. When the polluted indoor air exhausted and the fresh open air taken in pass a heat exchange element, exchange of temperature and humidity is performed.