KLS PERGE In Ceiling Counterflow Heat Recovery Units are designed to ensure fresh air needs of the buildings. It lowers heat loads caused by fresh air with using recovered heat inside the exhaust air. KLS PERGE is fully compile with ErP ECODESIGN regulations with its high efficiency alluminium counter flow heat recovery exchanger. Thaks to its bypass damper, while its preventing freezing of the heat exchanger, it also has “free cooling” function. PERGE operates fully automatic and Plug&Play. High efficiency EC fans are used for air circulation and if prefered, can be produced with an integrated last heater or cooler coil.