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Heating and Cooling / Facade Heating & Cooling Products

Ventilation units for mixing ventilation LG-ZM-L-B and LG-ZUM-M-LB, for horizontal floor mounting

Decentralized air conditioning via the building facade.

To air condition office and administrative buildings having facades with floor-to-ceiling glazing, Krantz supplies ventilation units for raised floor mounting; they provide the required minimum percentage of outdoor air and remove the internal cooling and heating loads. The unit type LG-ZUM-M-LB has an additional function with recirculated air.

Test test test


  • Outdoor air intake directly through the facade; return air extraction via central system
  • Cooling and heating via air-to-water heat exchanger
  • Cooling with outdoor air (free cooling)
  • Mixing & displacement ventilation close to facade
  • Energy-efficient EC radial-flow fan
  • F7 class filtration of outdoor air


Supply air volume flow rate:

33 l/s [120 m3/h]

Supply air temperature, summer:

18 °C (with outdoor air 32 °C / 40% relative humidity)

Total cooling output:

560 W


-for cooling down 33 l/s [120 m3/h] of outdoor air:

240 W

-for cooling a room with tR = 26 °C:

320 W

Chilled water temperature:


Supply air temperature, winter:

34 °C (with outdoor air –12 °C)

Total heating output:

1 840 W


– for heating up 33 l/s [120 m3/h] tR = 22 °C of outdoor air 1 360 W

– for room heating with tR = 22 °C: 480 W

Hot water temperature:

50 / 40 °C

Control signal for fan speed:

0 – 10 V DC

Effective power of fan:

20 W (volume flow = 120 m³/h)

Operating voltage:

30 V / 50 Hz

To find out how you could benefit from our product, talk to an expert today on 0203 912 6222 or fill out the form below