Consistently fresh, clean air on a small footprint

In offices and larger residential complexes, restaurants and canteens, schools and preschools, the WOLF compact series of ventilation units with heat recovery is always the perfect solution for convenient and energy efficient ventilation. The units provide rooms with filtered outdoor air in sufficient, variably adjustable amounts. At the same time, a corresponding volume of stale indoor air containing CO2 is removed and expelled as exhaust air.

With its small footprint and simple handling, the CKL unit conveniently replaces stale indoor air with fresh, filtered outdoor air. The highly efficient countercurrent plate heat exchanger transfers the valuable thermal energy from the extract air to the fresh, filtered outdoor air.


The ideal solution for indoor installation. Duct connections arranged vertically (CKL-iV) or horizontally (CKL-iH).
  • Compact air handling unit with output sizes CKL-iV/iH: 1300, 2200, 3000, 4000 and 5800 m³/h (max. air flow rate)
  • For indoor installation with horizontal duct connection.
  • For indoor installation with vertical duct connection.
  • Highly efficient (A+ rated as per Air Handling Directive 01).
  • Integral WRS-K control unit with many programmable inputs and outputs; can be extended to include auxiliary modules.
  • Automatic frost protection control.
  • Extensive range of accessories can be fitted (e.g. silencer, heating coil, cooling coil).
  • Highly efficient, variably adjustable EC fans.
  • VDI 6022 as standard.
  • LON, BACnet or Modbus interface module for connection to building management system.
  • Straightforward LAN connection via Ethernet interface with integral web server.