Supply and extract air units maintain a high air quality in rooms by supplying conditioned outdoor air to the room. For the discharge of the air, the unit has two radial fans.
The supply air fan takes in outdoor air, which flows through a volume flow limiter, a non-return damper, a shut-off damper and a fine dust filter. These components prevent the exceeding of the dimensioned outdoor air flow through wind pressure, the switching of the flow direction in case of a negative pressure on the façade and uncontrolled flows when the device is turned off. The F7 fine dust filter complies with the hygiene requirements of VDI 6022.
For the thermal conditioning of the outdoor air heat exchangers for heat recovery, heating and cooling are used. The heat recovery takes place recuperatively using a plate heat exchanger. A part of the heat in the extract air is transferred to the outdoor air. In energetically sensible cases, a bypass damper opens the heat recovery bypass during the transitional period and for the prevention of freezing.
Similar to displacement flow, the supply air flows through the floor grille into the room.
The extract air fan takes in the room air near the floor and discharges it outdoor through the heat exchanger for heat recovery, the non-return damper and the shut-off damper. A coarse dust filter in the extract air protects the fan and heat exchanger from dirt.
Static heating operation without ventilation is possible. The integrated thermal switch closes and the unit works like an underfloor unit.