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Blauberg KOMFORT Roto EC S 400 S21

Air handling unit with rotary heat exchanger. Maximum air flow up to 440 m³/h.
EAN codeEAN4058448058769
  • 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. Heat recovery is provided by the rotary heat exchanger and minimizes ventilation heat losses. Controllable air exchange for creating the best suitable indoor microclimate. Compatible with round Ø 125, 160 and 200 mm air ducts. Additional spigot for kitchen hood air duct connection.


High-efficient external rotor EC motors and centrifugal impellers 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 fan casing is made of polymer coated steel and is heat- and sound-insulated with mineral wool. The spigots are located at the top of the unit and are rubber sealed for airtight connection to the air ducts. The insulation of KOMFORT Roto EC S2(E) 200 is 20 mm, for KOMFORT Roto EC S(E) 280, 400 and 600 is 40 mm. KOMFORT Roto EC S(2): model without electric heater. KOMFORT Roto EC S(2)E: model with electric heater.


All units are equipped with a 5th spigot for connection to the kitchen hood air duct. The distinctive feature of KOMFORT Roto EC S2(E) 200 is the possibility to connect the kitchen hood DAH 251-13 (ordered separately) directly to the unit.


Two built-in G4 and F7 filters provide efficient supply air filtration. The unit KOMFORT ROTO EC S2(E) 280 features F7 filter.The G4 filter is used for extract air filtration.


The unit has a high-efficient rotary aluminium heat exchanger.The rotary regenerator is a short, rotating cylinder, filled with corrugated aluminium sheet layers. The air streams flow through them.The band layers of the heat regenerator first come in contact with the supply and then with extract air flows.Therefore the band is alternatively warmed up and cooled down and the extract air heat and humidity are transferred to the cold intake air. This way heat recovery reduces heat losses in the cold season and reduces operation load for air conditioner in the warm season.The advantages of the rotary regenerator as compared to the plate heat exchangers include no condensate generation, maintaining comfort air humidity and high freeze resistance.


The KOMFORT Roto EC S(2)E units are equipped with the electric heater. If the necessary temperature level of the supply air cannot be achieved through heat recovery, the heater turns on automatically and heats the air supplied to the premise. The heaters incorporate protective measures securing the safe unit operation.


The units can be fixed to the wall or mounted on the floor.During mounting stage the front and the back panels can be reversed providing either left-handed or right-handed unit mounting.


KOMFORT Roto EC S... 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.

Download the
Blauberg AHU
app for Android

Download the
Blauberg AHU
app for iOS

Functions Description
Control via Wi-Fi using a mobile application +
Control via a wired remote control panel
S22 control panel (option)
Control via a wireless remote control panel
S22 Wi-Fi control panel (option)
Control via a wired remote LCD control panel
S25 control panel (option)
BMS (Building Management Systems) RS-485
Blauberg Cloud Server service +
Speed selection +
Filter replacement indication by filter timer
Alarm indication full alarm description in the mobile application
Week-scheduled operation +
Timers +
Boost mode +
Fireplace mode +
Cooler connection option
Kitchen hood connection option
Minimum supply air temperature control +
Humidity control option
CO2 controller option
VOC controller option
PM2.5 control option
Fire alarm sensor connection option

Option: function is available when purchasing the appropriate accessory (see the "Accessories" tab).

Parameter KOMFORT Roto EC S 400 S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Max. power without electric heater 200 W
Max. unit power 200 W
Max. unit current without electric heater 1.4 A
Max. unit current 1.4 A
Max. unit power with electric heater - W
Max. unit current with electric heater - A
RPM 3280 min-1
Maximum air flow 122 l/s
Maximum air flow 440 m³/h
Sound pressure level at a distance of 3 m 33 dBА
EC motor yes -
Temperature of transported air -25…+40 °С
Insulating material 40 mm mineral wool mm
Extract filter G4 -
Supply filter G4, F7 -
Heat recovery efficiency 76–85 %
Heat exchanger type rotary -
Heat exchanger material aluminum -
Connected air duct diameter 160 mm
Weight 81 kg
Casing material painted steel -
SEC class A -
ErP 2016, 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
KOMFORT Roto EC S(E) - data sheet (pdf 2.31Mb)
KOMFORT Roto EC S(E)400(600) - user's manual (pdf 3.32Mb)
KOMFORT Roto EC S(E)400 S21 - image (png 278.68Kb)
S21 - user's manual (pdf 2.22Mb)
Modbus table for connecting S21 automation to BMS - user's manual (pdf 140.84Kb)
Designation key
Designation key
Series Unit type Motor type Spigot modification Insulation Heater type Rated air flow [m³/h] Control
KOMFORT Roto: rotary heat exchanger EC: electronically commutated motor S: vertical spigot orientation _: 40 mm

2: 20 mm
_: no heater

E: electric heater
200; 280; 400; 600 S21
    KOMFORT Roto EC S 400 S21
G4 panel filter FP 436x196x40 G4
F7 panel filter FP 436x196x40 F7
Control panel S22
Wi-Fi control panel S22 Wi-Fi
LCD Control panel S25
VOC sensor DPWQ30600
External CO₂ sensor DPWQ40200
CO₂ sensor with indication CD-1
CO₂ sensor CD-2
Humidity sensor DPWC11200
Humidity sensor HR-S
Internal humidity sensor FS2
Kitchen hood DAH 251-13
Silencer SD 160
Silencer SDF 160
Backdraft air damper VRV 160
Air damper VKA 160
Electric actuator LF230
Electric actuator TF230
Module for Modbus connection

Model Overall dimensions [mm]
Ø D Ø D1 B H H1 L
KOMFORT Roto EC S 400 S21 160 100 528 675 755 740
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3 m (1 m) [dBA]
1 170 33 (43)
2 170 33 (43)
3 170 32 (42)
4 68 31 (41)
5 65 28 (38)
6 59 27 (37)
7 26 23 (33)
8 25 21 (31)
9 25 19 (29)


Sound power level, A-weighted Total Octave frequency band [Hz] LpA 3 m LpA 1 m
63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 59 27 46 54 55 53 48 44 35    
LwA to supply outlet [dBA] 60 27 46 54 55 53 49 44 35    
LwA to exhaust inlet [dBA] 55 25 41 50 51 44 42 39 30    
LwA to exhaust outlet [dBA] 55 26 41 51 51 44 42 39 31    
LwA to environment [dBA] 54 18 36 47 49 48 43 37 33 33 43

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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