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

Privacy policy

Blauberg KOMFORT ERV D 250 S20

Suspended heat and energy recovery air handling unit. Maximum air flow up to 370 m³/h.
EAN codeEAN4058448001512
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Accessories
  • Dimensions

Air handling unit for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. Heat and humidity recovery minimizes ventilation heat losses during cold season and reduce air conditioner load during hot season. Controllable air exchange ensures the best suitable indoor microclimate. Compatible with round Ø 100 or 150 mm air ducts.


The casing is made of polymer coated steel panels, internally heat- and sound-insulated with 5–10 mm (depend on modification) polyurethane foam. The bottom service panel provides easy access for maintenance of the filters and the heat exchanger. The spigots for connection to the air ducts are located at the sides of the unit and are rubbed sealed for airtight connection to the air ducts. The mounting brackets on the casing ensure easy installation under the ceiling.



Asynchronous motors are used for air supply and exhaust. The units are equipped with a centrifugal impeller with forward curved blades. Integrated overheating protection with automatic restart. Ball bearings for longer service life. Dynamically balanced impellers. Featured with reliable and low-noise operation.


Two built-in G4 and F8 filters provide efficient supply air filtration. The G4 filter is used for extract air filtration.


The unit is equipped with an enthalpy plate cross-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.


Integrated control system based on triac speed controller CDT1 E.


Due to the low casing height the unit is the ideal solution for mounting in the limited space behind the suspended ceiling. The installation place must be easily accessible for servicing.


The integrated automatic freeze protection is used to prevent freezing of the heat exchanger in the cold season. The supply fan turns off according to the temperature sensor to get the heat exchanger warmed up with extract air. After that the supply fan turns on and the unit continues to run in the standard mode.

Parameter KOMFORT ERV D 250 S20 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
RPM 2400 min-1
Current 1.1 A
Maximum air flow 370 m³/h
Maximum air flow 103 l/s
Total unit power 250 W
Sound pressure level at 3 m 52 dBА
Transported air temperature -25...+40 °С
Insulation 5 mm, 10 mm mm
Extract filter G4 -
Supply filter G4 + F8 (PM2.5 > 93 %) -
Heat recovery efficiency 66...76 %
Humidity recovery efficiency 22...32 %
EC motor no -
Heat exchanger type cross-flow -
Heat exchanger material enthalpy -
Connected air duct diameter 150 mm
Outdoor mounting no -
Sound-insulated casing yes -
Air duct for round air ducts -
Type Supply and exhaust -
SEC class E -
Mounting ceiling mounting -
ErP 2016 -
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 ERV D S20 - data sheet (pdf 857.6Kb)
KOMFORT ERV D S20 - image (png 250.62Kb)
KOMFORT ERV D S20 - user's manual (pdf 1.66Mb)
KOMFORT ERV D 250 S20 - energy label (pdf 54.44Kb)
KOMFORT ERV D 250 S20 - specification (pdf 34.73Kb)
Designation key
Designation key
Series Unit type Mounting type Rated air flow [m³/h] Service side Control
KOMFORT ERV: energy recovery ventilation D: suspended mounting, horizontally directed spigots 150; 250; 350 R: right
L: left
S20: speed controller CDT1 E
G4 panel filter FP 300x220x48 G4
F8 panel filter FP 300x220x48 F8

Model Overall dimensions [mm]
Ø D B H L L1
KOMFORT ERV D 250 S20 149 704 227 947 854