Abstract: The fresh air heat exchangers function to supply ventilation, heating and air purification. The device does this whether the building is occupied or empty. The outside air is drawn in, filtered, then passed through the heat exchangers where room air is passed adjacent to it and its heat is extracted and transferred to the incoming fresh air. The room air is subsequently exhausted outside. The preheated fresh outside air continues on to a hot water coil where it is additionally heated and then passed over a UV cell for purification. The purified heated air is introduced to the room. In the building unoccupied phase, room air is cycled back into the room without bringing fresh air in.

Abstract: The fresh air heat exchangers function to supply ventilation, heating and air purification. The device does this whether the building is occupied or empty. The outside air is drawn in, filtered, then passed through the heat exchanger where room air is passed adjacent to it and its heat is extracted and transferred to the incoming fresh air. The room air is subsequently exhausted outside. The preheated fresh outside air continues on to a hot water coil where it is additionally heated and then passed over a UV cell for purification. The purified heated air is introduced to the room. In the building unoccupied phase, room air is cycled back into the room without bringing fresh air in.

Abstract: The fresh air heat exchangers function to supply ventilation, heating and air purification. The device does this whether the building is occupied or empty. The outside air is drawn in, filtered, then passed through the heat exchanger where room air is passed adjacent to it and its heat is extracted and transferred to the incoming fresh air. The room air is subsequently exhausted outside. The preheated fresh outside air continues on to a hot water coil where it is additionally heated and then passed over a UV cell for purification. The purified heated air is introduced to the room. In the building unoccupied phase, room air is cycled back into the room without bringing fresh air in.