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Blauberg KOMFORT Roto EC DE 250 L/R S21

Suspended heat recovery air handling units. Maximum air flow up to 310 m³/h.
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • BIM
  • 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 160 and 200 mm air ducts. Additional spigot for kitchen hood air duct connection.


The fan casing is made of galvanized steel, internally filled with mineral wool layer for heat and sound insulation. The spigots are located at the sides of the unit and are rubber sealed for airtight connection to the air ducts. KOMFORT Roto EC D(2)E – model with electric heater. The insulation of KOMFORT Roto EC DE is 40 mm, for KOMFORT Roto EC D2E is 20 mm. Unit maintenance is performed from the bottom panel side. The distinctive feature of KOMFORT Roto EC D2E is a low casing profile.



High-efficient external rotor EC motors and centrifugal impellers with forward 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.


Two built-in filters with G4 and F7 filtration class provide efficient supply air filtration. Optionally, a H13 supply air filter may be used. The G4 filter is used for extract air filtration.


The air handling unit is designed for suspension to a ceiling, wall mounting or mounting to a horizontal plane.



All the models are equipped with a fifth spigot for connection of the air duct from the kitchen hood.


The unit has a high-efficient rotary aluminium heat exchanger. The rotary heat exchanger is a short, rotating cylinder, filled with corrugated aluminium sheet layers. The air streams flow through them. The band layers of the heat exchanger 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 heat exchanger as compared to the plate heat exchangers include no condensate generation, maintaining comfort air humidity and high freeze resistance.


The KOMFORT Roto EC D(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.


KOMFORT EC D… 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 ROTO EC D(2)E S21
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 System) 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 +
Timer +
Boost mode +
Fireplace mode +
Cooler connection option
Kitchen hood 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 Roto EC DE 250 L/R S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Max. power without electric heater 135 W
Max. unit power 835 W
Reheater power consumption 700 W
Electric heater current 3.1 A
Max. unit current without electric heater 1.0 A
Max. unit current 4.1 A
RPM 2200 min-1
Maximum air flow 310 m³/h
Maximum air flow 86 l/s
Sound pressure level at 3 m 21 dBА
Transported air temperature -25...+40 °С
Insulation 40 mm mineral wool mm
Extract filter G4 -
Supply filter G4, F7 (Option: H13) -
Heat recovery efficiency 71-87 %
EC motor yes -
Heat exchanger type rotary -
Heat exchanger material aluminum -
Connected air duct diameter 160 mm
Weight 56 kg
Casing material galvanized steel -
Outdoor mounting no -
Sound-insulated casing yes -
SEC class A -
Mounting ceiling mounting, wall mounting -
ErP 2016, 2018 -
* Heat recovery efficiency is specified in compliance with EN 13141-7. -
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 Roto EC D - user's manual (pdf 3.95Mb)
KOMFORT Roto EC DE S21 - data sheet (pdf 1.61Mb)
KOMFORT Roto EC DE S21 - image (png 310.97Kb)
KOMFORT Roto EC DE 250 S21 - energy label (pdf 96.6Kb)
KOMFORT Roto EC DE 250 S21 - specification (pdf 79.62Kb)
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 Unit type Motor type Mounting type Modification Heater type Rated air flow [m³/h] Service side Control
KOMFORT Roto: rotary heat exchanger EC: electronically commutated motor D: suspended mounting, horizontally directed spigots _: standard (insulation 40 mm)

2: low-profile (insulation 20 mm)
E: electric heater 250; 350; 650 L: left

R: right

  KOMFORT Roto EC DE 250 L/R S21
G4 panel filter FP 260х220х48 G4
F7 panel filter FP 260х220х48 F7
H13 panel filter FP 260х220х48 H13
Control panel S22
Wireless control panel S22 Wi-Fi
LCD Control panel S25
VOC sensor DPWQ30600
External CO2 sensor DPWQ40200
Humidity sensor DPWС11200
Humidity sensor HR-S
Humidity sensor FS2
Kitchen hood DAH 251-13
Backdraft air damper VRV 160
Air damper VKA 160
Electric actuator LF230
Electric actuator TF230

Model Overall dimensions [mm]
D D1 B B1 H H1 L L1
KOMFORT Roto EC DE 250 L/R S21 160 125 643 688 308 345 1003 1100
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3 m (1 m) [dBA]
1 101 21 (31)
2 115 21 (31)
3 80 20 (30)
4 45 18 (28)
5 42 17 (27)
6 40 17 (27)
7 17 16 (26)
8 17 16 (26)
9 16 16 (26)


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] 58 21 42 45 56 53 42 32 21    
LwA to supply outlet [dBA] 59 21 43 45 56 53 42 32 21    
LwA to exhaust inlet [dBA] 53 20 38 42 52 44 36 29 18    
LwA to exhaust outlet [dBA] 54 20 38 43 53 44 36 29 18    
LwA to environment [dBA] 43 10 28 39 38 35 32 31 29 23 33

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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