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Blauberg KOMFORT EC DE 4000-21 R

Suspended heat recovery air handling unit. Maximum air flow up to 4000 m³/h.
EAN codeEAN4058448021350
  • Description
  • Characteristics
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  • Designation key
  • Accessories
  • Dimensions
  • Capacity diagram

Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. For controllable mechanical energy saving ventilation systems. Heat recovery minimises ventilation heat losses. Control of air exchange for creating comfortable indoor microclimate. Compatible with round Ø 160 to 400 mm air ducts.


The casing is made of double-skinned aluzinc panels, internally filled with 20 or 25 mm mineral wool layer for heat and sound insulation. The casing has fixing brackets with vibration absorbing connectors for easy installation. The spigots for connection to the air ducts are located at the side of the unit and are rubber sealed for airtight connection to the air ducts. The service panel ensures easy access to the internals for cleaning, filter replacement and other maintenance operations.



High-efficient external rotor EC motors and centrifugal impellers with backward curved blades are used for air supply and exhaust. EC motors have the best power consumption to air flow ratio and meet the latest demands concerning energy saving and high-efficient ventilation. EC motors are featured with high performance, low noise level and totally controllable speed range. Dynamically balanced impellers.


The unit is equipped with a plate counter-flow aluminium heat exchanger for heat recovery. The unit condensate is collected and drained to the drain pan under the heat exchanger. The air flows are completely separated in the heat exchanger. Thus smells and contaminants are not transferred from the extract air to the supply air. Heat recovery is based on heat and/or humidity transfer through the heat exchanger plates. In the cold season supply air is heated in the heat exchanger by transferring the heat energy of warm and humid extract air to the cold fresh air. Heat recovery minimizes ventilation heat losses and heating costs respectively. In the warm season the heat exchanger performs reverse and intake air is cooled in the heat exchanger by the cool extract air. That reduces operation load on air conditioners and saves electricity.


The electronic frost protection system based on bypass and heater is used to prevent the heat exchanger freezing in cold seasons. The bypass damper is opened and the heater is turned on automatically according to the feedback from the temperature sensor. Cold intake air passes by the heat exchanger and is warmed up to set temperature in the heat exchanger. Synchronously extract air that passes by the heat exchanger is used for its defrosting. After a freezing danger is over the bypass damper is closed, the heater is turned off. The unit reverts to the normal operation mode.


The unit is equipped with an electric heater for operation during cold seasons at low outside temperature. The integrated electric heater is activated to warm up supply air flow if set indoor air temperature may not be reached by means of heat recovery only. Smooth heat output control ensures automatic supply air temperature maintaining. Two integrated overheat protection thermostats, one actuated at +60 °C with automatic restart and the other one actuated at +90 °C with manual restart.


The built-in G4 supply filter and G4 extract filter provide air filtration.


The unit incorporates an integrated control system with a wall-mounted control panel and a sensor display. The standard delivery set includes a 10 m cable for connection of the unit and the control panel. Automation functions:

  • Activating/deactivating the unit.
  • Setting required speed for the supply and extract fan for the unit air flow control. Each speed is individually adjusted during set-up.
  • Automatic heater activation/deactivation and smooth heat output control. Heater overheating protection. Cooling of the heater at the end of the heating cycle.
  • Opening/closing the bypass damper for summer ventilation.
  • Setting and maintaining room or duct air temperature.
  • Timer activation/deactivation and set-up.
  • Setting day- and week-scheduled operation of the unit.
  • Operation control on feedback from FS1 duct humidity sensor (available separately) or on the humidity sensor in the control panel.
  • Filter clogging control.
  • System shutdown on signal from the fire alarm panel.
  • Controlling supply and exhaust air dampers (to be ordered separately).
  • Cooler control (available separately).

Ceiling mounting with fixing brackets. The correct mounted unit must provide free condensate collection and drainage as well as good access for servicing and filter replacement. Access for maintenance on the bottom.

Parameter KOMFORT EC DE 4000-21 R Measurement unit
Voltage 400 V
Phase 3 ˜
Frequency 50/60 Hz
Max. power without electric heater 1980 W
Max. unit current without electric heater 3.4 A
Max. unit power with electric heater 23000 W
Max. unit current with electric heater 33.4 A
Electric heater power 21000 W
RPM 2580 min-1
Electric heater current 30.0 A
Maximum air flow 4000 m³/h
Maximum air flow 1111 l/s
Sound pressure level at 3 m 59 dBА
Insulation 25 mm mineral wool mm
Transported air temperature -25…+40 °С
Extract filter G4 -
Supply filter G4 -
Heat recovery efficiency 75 %
Heat exchanger type cross-flow -
Heat exchanger material aluminum -
Weight 290 kg
Connected air duct diameter 400 mm
Casing material aluzinc -
SEC class NRVU -
Mounting ceiling mounting -
ErP 2016 -
Documents archieve
Documents archieve
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  • Catalogues
  • Technical documentation
  • Certificates
KOMFORT EC DE - data sheet (pdf 1006.29Kb)
KOMFORT EC DE - user manual (pdf 7.08Mb)
KOMFORT EC DE - image (png 455.42Kb)
Control system for units based on Freemax controllers and AC208A2 sensor control panels - user’s manual (pdf 6.61Mb)

Designation key
Designation key
Series Motor type Mounting type Heater type Rated air flow [m³/h]   Heater power [kW] Service side
KOMFORT EC: electronically commutated motor D: suspended mounting, horizontally directed spigots E: electric heater 2000; 4000 12; 21 R: right
    KOMFORT EC DE 4000-21 R
G4 panel filter FP 827x741x48 G4
Silencer SD 400
Silencer SDF 400
Backdraft air damper VRV 400
Air damper VKA 400
Internal humidity sensor FS1
Electric actuator LF230
Electric actuator TF230

Model Overall dimensions [mm]
D B B1 B2 H L L1
KOMFORT EC DE 4000-21 R 399 1265 1130 563 881 1835 1888
Capacity diagram
Capacity diagram