Not registered yet? Take advantages of registration:
Products saving in a binding to the projects
Online consultation from experts

Privacy policy

Blauberg KOMFORT EC DB350 S21

Suspended heat recovery air handling unit. Maximum air capacity up to 410 m³/h.
EAN codeEAN4058448064821
  • 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 minimises ventilation heat losses.Controllable air exchange for creating the best suitable indoor microclimate.Compatible with round Ø 125 and 160 mm air ducts.


The casing is made of double-skinned aluzinc panels, internally filled with 40 mm mineral wool layer for heat and sound insulation.The panel of the casing ensures easy access to the internals for cleaning and other maintenance operations.The spigots for connection to the air ducts are located at the sides of the unit and are rubber sealed for airtight connection to the air ducts.


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.


Built-in F7 filter provide efficient supply air filtration.
The G4 filter is used for extract air filtration.

The units are equipped with the 100 % bypass for summer ventilation (room cooling by the cool intake air).

Heat recovery Mounting

The unit is equipped with a plate counter-flow aluminium heat exchanger for heat recovery. In 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 units are designed for ceiling or wall mounting.The mounting place must provide enough space for connection to drain system and condensate drainage using the SFK 20x32 kit (available separately).

Control and automation

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

Download the
Blauberg AHU
app for Android

Download the
Blauberg AHU
app for iOS

The KOMFORT EC DB S14 units have an integrated automation system with a wall-mounted control panel S14 with a LED indication.

Automation functions  
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
Blauberg Cloud Server service +
Speed selection + +
Filter replacement indication

according to filter timer

according to filter timer

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)
Reheater connection option
Cooler connection option
Minimum supply air temperature control +
Humidity control option option
COcontroller 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 DB350 S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Total unit current 1.3 A
RPM 3200 min-1
Air capacity 410 m³/h
Air capacity 114 l/s
Total unit power 170 W
Sound pressure level at 3 m distance 34 dBА
Temperature of transported air -25...+40 °С
EC motor yes -
Insulating material 40 mm mineral wool mm
Supply filter F7 -
Extract filter G4 -
Heat recovery efficiency 80...91 %
Heat exchanger type counter-flow -
Heat exchanger material aluminum -
Weight 70 kg
Connected air duct diameter 160 mm
Casing material aluzinc -
Outdoor mounting no -
Sound-insulated casing yes -
Air duct for round air ducts -
Type Supply and exhaust -
SEC class A+ -
Mounting ceiling mounting, wall mounting -
ErP 2016, 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
KOMFORT EC DB - data sheet (pdf 1.32Mb)
KOMFORT EC DB - user's manual (pdf 4.24Mb)
KOMFORT EC DB S21 - image (png 326.39Kb)
KOMFORT EC DB350 S21 - energy label (pdf 94.05Kb)
KOMFORT EC DB350 S21 - specification (pdf 74.17Kb)
S21 - user's manual (pdf 2.21Mb)
Designation key
Designation key
Series Motor type Mounting type Bypass Nominal air flow [m³/h] Service side Control
KOMFORT EC: electronically commutated motor D: suspended mounting, horizontally oriented spigots B: integrated bypass 160; 250; 350
R: Right
L: Left
    KOMFORT EC DB350 S21
G4 panel filter FP 403x253x48 G4
F7 panel filter FP 403x253x48 F7
Control panel S22
Wi-Fi control panel S22 Wi-Fi
LCD control panel S25
Internal humidity sensor FS2
CO2 sensor with indication CD-1
CO2 sensor CD-2
CO2 sensor DPWQ40200
VOC sensor DPWQ30600
Humidity sensor HR-S
Humidity sensor DPWC11200
Electric preheater EVH-160
Electric reheater ENH 160
Syphon kit SFK 20x32
Air damper VKA 160
Electric actuator LF230

Model Dimensions [mm]
D B H H1 L
KOMFORT EC DВ350 S21 160 1044 320 363 1135
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3m (1m)
1 169 34 (44)
2 169 34 (44)
3 169 33 (43)
4 87 28 (38)
5 86 28 (38)
6 84 27 (37)
7 20 22 (32)
8 19 22 (32)
9 19 21 (31)


Sound power level, A-weighted Octave frequency band [Hz] LpA, 3 m [dBA]  LpA, 1 m [dBA] 
Gen. 63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 60 46 54 58 50 46 40 40 31    
LwA to supply outlet [dBA] 63 52 58 60 54 46 40 41 35    
LwA to exhaust inlet [dBA] 61 47 54 58 50 47 41 41 32    
 LwA to exhaust outlet [dBA] 63 51 58 59 56 46 40 41 35    
LwA to environment [dBA] 55 44 51 51 43 38 32 28 24 34 44

* Data provided for point 1 of the air flow diagram