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Blauberg KOMFORT EC LBE 400-E S21

Heat recovery air handling unit. Maximum air flow up to 540 m³/h.
EAN codeEAN4058448061790
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Accessories
  • Dimensions
  • Additional characteristics

Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. Used to create controlled energy-saving ventilation systems. The heat recovery technology is used to minimize ventilation heat losses. Control of air exchange for creating comfortable indoor microclimate. Compatible with round Ø 160, 200 or 250 mm air ducts.


The casing is made of double-skinned aluzinc panels, internally filled with mineral wool layer 40 mm for heat- and sound-insulation. The casing has mounting brackets with anti-vibration rubber mounts for easy installation. The unit is equipped with service hatches on the side panels for easy maintenance of filters. This design enables the left-hand and right-hand installation of the unit. The spigots are located at the sides of the unit and are equipped with rubber seals for airtight connection to the air ducts.



High-efficient external rotor EC motors and centrifugal impellers are used for air supply and exhaust. The forward curved blades in KOMFORT EC LB(E) 300/LB(E) 400 provide permanent air flow. The KOMFORT EC LB(E) 700 model has impellers with backward curved blades. EC motors have the best power consumption to air capacity 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. The impellers are dynamically balanced.


The KOMFORT EC LB(E)… unit is equipped with a plate counter-flow polystyrene heat exchanger for heat recovery. The unit condensate is collected and drained to the drain pan under the heat exchanger.The KOMFORT EC LB(E)…-E unit is equipped with an enthalpy plate counter-flow heat exchanger for energy (heat and humidity) recovery. Due to humidity recovery condensate is not generated in the enthalpy 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.


Two built-in G4 and F7 filters provide efficient supply air filtration. The G4 filter is used for extract air filtration.


The KOMFORT EC LBE S21 units are equipped with an electric heater for additional heating of supply air downstream of the heat exchanger. The KOMFORT EC LB S21 units are not equipped with built-in heaters but both a preheater and a reheater can be purchased separately.


The KOMFORT EC LB(E) S21 model is equipped with a bypass which is automatically opened in summer if there is a need to cool down the ventilated area with cool intake air. If the unit is equipped with an electric heater, the bypass is used for freeze protection of the heat exchanger.


Mounting on floor or ceiling with fixing brackets. The correct mounted unit must provide condensate collecting and drainage as well as access to service mounting and filter replacement.


KOMFORT EC LB… S21 units are equipped with an integrated automation system. The remote control panel is not included in the delivery set (purchased separately). The S21 controller allows integrating the unit into the Smart Home system or BMS (Building Management System). The unit can be controlled via the Blauberg AHU mobile application via Wi-Fi.

the Blauberg AHU
app for Android

the Blauberg AHU
app for iOS

Functions KOMFORT EC LB(E) S21  
Unit control via Wi-Fi using a mobile application +  
Unit control via a wired remote control panel
S22 control panel (option)
Unit control via a wireless remote control panel
S22 Wi-Fi control panel (option)
Unit control via a wired remote LCD control panel
S25 control panel (option)
BMS (Building Management System) RS-485  
Blauberg Cloud Server service +  
Speed selection +  
Filter replacement indication by hour meter readings  
by filter clogging differential pressure switch  
Alarm indication full alarm description in the mobile application  
Week-scheduled operation +  
Bypass automatic  
Timer +  
Boost mode +  
Fireplace mode +  
Freeze protection through cyclic stops of the supply fan  
through preheating (option)  
using a bypass  
Reheater connection option  
Cooler connection option  
Minimum supply air temperature control +  
Humidity control option  
CO2 control option  
VOC control option  
PM2.5 control option  
Fire alarm sensor connection option  
Option: function is available when purchasing the appropriate accessory (see the "Accessories" section).
Parameter KOMFORT EC LBE 400-E S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Max. power without electric heater 289 W
Max. unit current without electric heater 2.1 A
Max. unit power with electric heater 3089 W
Max. unit current with electric heater 14.3 A
Electric heater power 2800 W
Electric heater current 12.2 A
Maximum air flow 150 l/s
Maximum air flow 540 m³/h
Sound pressure level at 3 m 27 dBА
Insulation 40 mm mineral wool mm
Transported air temperature -25…+40 °С
Extract filter G4 -
Supply filter G4, F7 -
Heat recovery efficiency 78–89 %
Heat exchanger type counter-flow -
Heat exchanger material enthalpy -
Weight 76 kg
Connected air duct diameter 200 mm
Casing material galvanized steel -
SEC class A -
Mounting ceiling mounting, floor mounting -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
KOMFORT ЕС LB(E) - data sheet (pdf 1.68Mb)
KOMFORT ЕС LB - user's manual (pdf 4.31Mb)
KOMFORT ЕС LB ... S21 - image (png 412.53Kb)
KOMFORT EC LBE400-E S21 - energy label (pdf 52.55Kb)
KOMFORT EC LBE400-E S21 - specification (pdf 34.92Kb)
S21 - user's manual (pdf 611.32Kb)
Modbus table for connecting S21 automation to BMS - user's manual (pdf 137.99Kb)
Designation key
Designation key
Series Motor type Spigot modification Bypass Heater type Nominal air flow, [m³/h] Heat exchanger type Control
KOMFORT EC: electronically commutated motor L: horizontal spigot orientation B: with a bypass _: without a heater
E: electric heater
300; 400; 700 _: heat recovery
E: energy recovery
    KOMFORT EC LBE 400-E S21
Panel filter G4 FP 600х205х48 G4
Panel filter F7 FP 600х205х48 F7
Control panel S22
Wi-Fi control panel S22 Wi-Fi
LCD control panel S25
Indoor humidity sensor FS2
CO₂ sensor with indication CD-1
CO₂ sensor CD-2
Humidity sensor HR-S
Preheater EVH 200 S21 V.2
Silencer SD 200
Non-return valve VRV 200
Air damper VKA 200
Drain pump CP-2
Air damper actuator TF230

Model Overall dimensions [mm]
Ø D B B1 H L L1
KOMFORT EC LBE 400-E S21 197 682 596 504 1094 1191
Additional characteristics
Additional characteristics
Point Power [W] Sound pressure level at 3 m (1 m) distance [dBA]
1 240 27 (37)
2 215 26 (36)
3 196 26 (36)
4 89 21 (31)
5 80 21 (31)
6 72 20 (30)
7 27 19 (29)
8 26 19 (29)
9 24 17 (27)


Sound power level, A-weighted Total Octave band [Hz] LpA 3 m LpA 1 m
63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 71 52 57 57 68 64 64 59 53    
LwA to supply outlet [dBA] 56 44 49 47 52 47 41 31 24    
LwA to exhaust inlet [dBA] 70 52 56 60 66 62 64 60 53    
LwA to exhaust outlet [dBA] 58 39 49 52 53 49 46 35 24    
LwA to environment [dBA] 48 32 37 40 45 36 38 35 30 27 37

Data for point 1 in the performance diagram


Calculation of air temperature downstream of the heat exchanger:
t = toutd + khr × (textr - toutd) / 100,

where toutd – outdoor air temperature [°C] textr – extract air temperature [°C] khr – heat exchanger efficiency (according to the diagram) [%]