Abstract: The heat exchanging unit includes an indoor air exhaust passageway, an outdoor air supply passageway, a heat exchange element, and a first air cleaning member. The indoor air exhaust passageway exhausts indoor air to an outdoor space as exhaust air. The outdoor air supply passageway supplies outdoor air to an indoor space as supply air. The heat exchange element exchanges at least a sensible heat of the sensible heat and a latent heat between the exhaust air and the supply air. The heat exchange element communicates with the indoor air exhaust passageway and the outdoor air supply passageway. The first air cleaning member is provided at a supply airflow upstream side of the heat exchange element. The first air cleaning member has an apatite that has a photocatalytic function.

Abstract: The present invention relates to an electric current producing cell which contains an anode, a cathode having as a cathode-active material one or more carbon-sulfur compounds of the formula (CS.sub.x).sub.n, in which x takes values from 1.2 to 2.3 and n is greater or equal to 2, and where the redox process does not involve polymerization and de-polymerization by forming and breaking S--S bonds in the polymer backbone. The cell also contains an electrolyte which is chemically inert with respect to the anode and the cathode.