SupraBox COMFORT (V) with vertical connections

For a pleasant feeling of well-being

The Rosenberg SupraBox COMFORT energy recovery units are space-saving and distinguished primarily by their high energy efficiency. They provide an energy-saving ventilation system for real estate such as restaurants, retail shops, hotels, office buildings and many more.

As a vertical (V) connection option, the SupraBox COMFORT units are available in 4 sizes with different nominal air flow rates. These range from 800 - 2,000 m³/h.

SupraBox COMFORT V - Unit Overview

SupraBox COMFORTNominal air flow rateExternal pressure increase
800 V 800 m³/h 150 Pa
1100 V 1,100 m³/h 200 Pa
1500 V 1,500 m³/h 200 Pa
2000 V 2,000 m³/h 250 Pa


Hygiene requirements

The SupraBox COMFORT energy recovery unit corresponds to the current state of standardisation in accordance with VDI 6022. The units are smooth (coil coated inside and out - RAL 7035) and easy to clean.


The units have a sturdy frameless casing. The casing has a double-skinned design. The inner and outer panels are made of 1 mm galvanised steel sheet (coil coated). The insulation thickness is 40 mm.

Heat recovery

High efficiency counterflow heat exchangers with over 90% efficiency are utilised for heat recovery. Complete separation of the supply air and return air without odour transfer is ensured.


Fine dust filters of the F7 filter class for the supply air and the M5 class (formerly F5) for the return air are utilised as a standard feature. Quick-release clips allow for fast and easy filter changes.

Tube / duct connections

The connections are designed to be sufficiently large. The connection dimensions comply with the customary industrial standard nominal sizes (round connection).

EC fans

Free-running impellers with backward curved centrifugal impellers and modern EC motors manufactured in-house allow for a quiet and energy-efficient operation of the entire series.

Integrated Control

The SupraBox COMFORT compact ventilation units come standard with an integrated control. All internal unit components are already pre-wired. Temperature control is possible with an optionally available heater/cooler. Many control functions are integrated into the software and can also easily be subsequently activated. A control unit for setting the target values is included as standard.

» Accessories

Duct silencer

  • available for all SupraBox COMFORT (V)
  • round connections
  • outer casing and perforated inner duct of galvanised sheet steel
  • sound dampening 50 mm
  • socket with lip seal
  • for direct integration into the pipe system

Flexible connections

  • available for all SupraBox COMFORT (V)
  • round connections
  • for decoupling the SupraBox to the duct system
  • complete set consisting of 4 pieces
  • made of galvanised steel and silicone-free PVC fabric
  • the right connection for standard spiral ducts
  • T-lip seal for quick and tight connections

Manually-operated shut-off valve

  • available for all SupraBox COMFORT (V)
  • round connections
  • tight-sealing, tightness category 4 behind closed baffle
  • damper blade is made of doubled sheet steel and has
    a gasket of EPDM rubber placed in between the blades
    which rests on the inside of the valve sleeve when closed

Motor-driven shut-off valve

  • available for all SupraBox COMFORT (V)
  • round connections
  • tight-sealing, tightness category 4 behind closed baffle
  • design as manually operated shut-off valve,
    but with console for motor drive including suitable servo motor
  • function open/close, voltage 24V, without return spring
    (with return spring upon request)

Electronic reheater coil

  • available for all SupraBox COMFORT (V)
  • round connections
  • for post-tempering of the supply air
  • installation kit consisting of electric heater coil and duct temperature sensor
  • available in different capacities
  • integrated continuous electronic control with thyristor,
    allowing for capacity control from 0-100%
  • actuation of the control electronics via the SupraBox via 0...10V
  • caution: only suitable for indoor installation

PTC electronic pre-heater

  • available for SupraBox COMFORT 800 V and 1100 V
    (from SupraBox COMFORT 1100 V electronic pre-heater as installation kit)
  • for optimum antifreeze protection
  • installation kit for installation in the outdoor air outlet
  • PTC electronic pre-heater and duct temperature sensor
  • integrated temperature sensor
  • caution: only suitable for indoor installation

Electronic pre-heater

  • available from SupraBox COMFORT 1500 V - 2000 V
  • for optimum antifreeze protection
  • coil similar to the electronic repeaters
  • switching on and off via SupraBox 
    (integrated contactor)
  • caution: only suitable for indoor installation

PWW Reheater

  • available for all SupraBox COMFORT (V)
  • transitions round
  • for post-tempering of the supply air
  • available per size with 2 or 4 pipe series
  • galvanised steel frame
  • blade spacing 2.0 mm, equivalent to DIN EN 13053
  • antifreeze protection thermostat already mounted on coil frame

PKW Aftercooler

  • available for all SupraBox COMFORT (V)
  • transitions round
  • for post-tempering of the supply air
  • galvanised steel frame
  • condensate tub aluminium AlMg3, condensate drain 1/2"
  • blade spacing 2.5 mm, equivalent to DIN EN 13053

Replacement filter, exhaust filter M5

  • available for all SupraBox COMFORT

Replacement filter, supply air filter F7

  • available for all SupraBox COMFORT

» Defrosting concept / antifreeze protection

Freezing of the heat exchanger

The surface temperature of the counterflow plate heat exchanger decreases with falling outside temperatures. If this falls below the dew point of the exhaust air, condensate drops on the plates of the heat exchanger. The dew point depends on the absolute humidity content of the air. Although the condensation energy of the water increases the efficiency of the counterflow plate heat exchanger that is related to the air supply, freezing takes place here under certain conditions.

If the units of the SupraBox COMFORT series are used in applications where the exhaust air is only slightly humid, heat recovery can work well below -10°C without losses. If the exhaust air comes from wet rooms, however, antifreeze protection may already be needed at -5°C and below.

Since the average outdoor temperature in Central Europe is typically above 0°C during the heating season, there are only a few days a year where antifreeze protection is necessary. Thus, efficiency rating reductions in this area have a diminishing impact on the efficiency rating of the unit over the whole year.

Intelligent 3-sequence defrosting concept

All compact air handling units in the SupraBox COMFORT series include an intelligent 3-sequence defrosting concept. The special feature here is that the integrated bypass of the equipment is NOT used to defrost the counterflow plate heat exchanger. An expensive, highly dimensioned reheater is not needed because the heat recovery is not bypassed.

Depending on the settings done during the commissioning as well as the accessories used, up to 3 sequences are available to defrost the counterflow plate heat exchanger. These are explained as follows.

The counterflow plate heat exchanger is monitored for freezing using a differential pressure switch. If the heat exchanger freezes, this is detected by the differential pressure switch and the defrosting operation is initiated automatically by the control.

During commissioning, the antifreeze strategy to be used can be defined (sequences).

  1. If an imbalance of the fans is allowed (adjustable via keypad), the supply air fan is reduced by 30% in the event of freezing to generate defrosting from the warmer exhaust air.
  2. If an electronic preheating is connected (accessory) and released (adjustable via keypad), this is activated in the event of freezing to preheat the outside air and thus defrost the heat exchanger.
  3. If both options have been released, the supply air will be reduced first. If this is not sufficient, the preheating is activated after 5 minutes.
  4. If neither measure is effective or none of the measures are possible (missing release), the SupraBox COMFORT is disabled and an alarm is displayed. After 10 minutes, the SupraBox COMFORT restarts the fans automatically and the sequences are "executed" again. An acknowledgement of the alarm is not necessary.

Antifreeze protection - preheating for prevention

Optionally, the preheating can be used preventively by setting the control unit of the SupraBox COMFORT unit. If this is the case, the pre-heating is already switched on at an adjustable outdoor air temperature to prevent the heat exchanger freezing.


Information: SupraBox COMFORT without control (Type:E) Information: SupraBox COMFORT without control (Type:E)

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Operating manual: SupraBox COMFORT (V) Operating manual: SupraBox COMFORT (V)

Dateiformat: .pdf

Dateigröße: 1.20 MB

Operating manual: Controller for SupraBox COMFORT Operating manual: Controller for SupraBox COMFORT

Dateiformat: .pdf

Dateigröße: 2.26 MB

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