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Blauberg KOMFORT EC LB300 S21

Heat recovery air handling unit. Maximum air flow up to 380 m³/h.
EAN codeEAN4058448061684
  • 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. In 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 enegry (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. The KOMFORT EC LB S14 unit is equipped with a bypass that is opened manually. 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 a build-in 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 Systems). 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

The KOMFORT EC LB S14 units have an integrated control system with a wallmounted control panel S14 with a LED indication.

Unit control via Wi-Fi using a mobile application + -
Unit control via a wired remote control panel
S22 control panel (option)
S14 control panel
Unit control via a wireless remote control panel
S22 WiFi control panel (option)
Unit control via a wired remote LCD control panel
S25 control panel (option)
BMS (Building Management Systems) RS-485 -
Wi-Fi -
Ethernet -
Blauberg Cloud Server service + -
Speed selection + +
Filter replacement indication according to hour meter readings according to hour meter readings
according to filter clogging differential pressure switch readings -
Alarm indication full alarm description in the mobile application LED alarm indication
Week-scheduled operation + -
Bypass automatic -
manual manual
Timers + -
Boost mode + -
Fireplace mode + -
Freeze protection through cyclic stops of the supply fan 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 option
CO2 controller option option
VOC controller option -
PM2.5 control option -
Fire alarm sensor connection option option
option: function is available when purchasing the appropriate accessory (see the "Accessories" section).
Parameter KOMFORT EC LB300 S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Max. power without electric heater 182 W
Max. unit current without electric heater 1.4 A
Max. unit power with electric heater 182 W
Max. unit current with electric heater 1.4 A
RPM 2100 min-1
Electric heater power W
Electric heater current A
Air capacity 106 l/s
Air capacity 380 m³/h
Sound pressure level at 3 m distance 24 dBА
Temperature of transported air -25…+40 °С
Insulating material 40 mm mineral wool mm
Extract filter G4 -
Supply filter G4, F7 -
Heat recovery efficiency 80–98 %
Heat exchanger type counter-flow -
Heat exchanger material polystyrene -
Weight 63.1 kg
Connected air duct diameter 160 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
KOMFORT ЕС LB - data sheet (pdf 1.76Mb)
KOMFORT ЕС LB - user manual (pdf 4.42Mb)
KOMFORT ЕС LB ... S21 - image (png 412.53Kb)
KOMFORT EC LB300 S21 - energy label (pdf 52.45Kb)
KOMFORT EC LB300 S21 - specification (pdf 34.9Kb)
S21 - user's manual (pdf 2.21Mb)
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 LB300 S21
Panel filter G4 FP
484x178x48 G4
Panel filter F7 FP
484x178x48 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
VOC sensor DPWQ30600
CO₂ sensor DPWQ40200
Humidity sensor   DPWC11200
Reheater   ENH 160
Preheater EVH 160
Silencer SD 160
Silencer SDF 160
Non-return valve VRV 160
Air damper VKA 160
Drain pump CP-2
Air damper actuator LF230
Air damper actuator TF230

Model Overall dimensions [mm]
ØD B B1 H L L1
KOMFORT EC LB300 S21 157 566 480 479 1083 1180
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3 m (1 m) [dBA]
1 155 24 (34)
2 143 23 (33)
3 119 23 (33)
4 61 20 (30)
5 56 20 (30)
6 46 20 (30)
7 20 13 (23)
8 19 13 (23)
9 18 13 (23)


Sound power level, A-weighted Gen. Octave frequency band [Hz] LpA 3 m [dBA] LpA 1 m [dBA]
63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 67 50 55 56 62 60 62 56 50    
LwA to supply outlet [dBA] 53 42 47 46 46 44 39 29 21    
LwA to exhaust inlet [dBA] 68 56 54 61 62 59 61 56 50    
LwA to exhaust outlet [dBA] 55 42 47 51 48 46 43 31 22    
LwA to environment [dBA] 45 34 35 40 39 32 36 31 27 24 34

Data provided for point 1 of the air flow 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) [%]

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