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Ceiling air cooler / Evaporator

Flat dual discharge ceiling air cooler


HFC | CO2 |  Water | Brine

  • Flush ceiling mounting for maximum hygiene and maximum room height utilisation
  • Draught-free working owing to low air speed
  • EC fans for energy-efficient operation (up to top mark A+)
  • Easy access to the entire unit for cleaning and maintenance work
  • Low moisture loss in goods thanks to large surfaces and a highly efficient tube system
  • Particularly quiet design for a pleasant working atmosphere

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Top class ceiling air cooler


The energy-efficient dual discharge ceiling air cooler meets the requirements of cold rooms above freezing point. With its draught-free, quiet running and various corrosion protection types, it is particularly suitable for use in food processing, storage and logistics, commercial cooling and similar applications. Its design allows easy access for cleaning and maintenance work.

Product benefits

Your advantages at DHN

Corrosion protection

for heat exchanger with tin-coated cupper tubes and 2-component lacquered coating

EC-fan technology

standard for optimum energy efficiency in all sizes

Flush ceiling mounting

for maximum hygiene and maximum room height utilisation

Double drip pan construction

to avoid condensation

Thick fins:

Heat exchanger with thick fins for cleaning with a high-pressure cleaner

High-performance tube systems:

Aligned Roller high-performance tube systems with internally grooved tubes

Dehumidification mode

with downstream electric heating rods (option)

Fully aluminium housing,

scratchproof powder-coated finish


All product advantages at a glance


  • Cooling capacity from 1.5 to 20 kW
  • Temperature range: 0 – 50 °C 
  • Fin spacings 4 / 6  mm 
  • Defrosting: electric, optional: Brine, hot gas
  • Heat exchanger coil for an operating pressure of 25 bar/ 80 bar with CO2
  • Very quiet EC fans

Easy assembly

  • Generously sized spaces at the sides of the unit for easy access via side doors, removable
  • Drip pan for cleaning and servicing work hinged on both sides and easily removable
  • Connections with threaded nipple, ventilation and drain valve (water or brine mode)
  • Both evaporator coils are brought together on a shared inlet and outlet tube

Inspection and cleaning

  • Removable hinged drip pan for cleaning and servicing work
  • Side doors can easily be removed
  • Aligned tube pattern and fin spacings of up to 6 mm for easy cleaning
  • Design geared to the HACCP concept (easy access to the entire unit for cleaning and maintenance work)
  • Heat exchanger can be cleaned from three sides
  • Thick fins (0.3 mm) for extra stability during cleaning

Energy efficiency

  • Air cooler energy efficiency class up to top mark "A+" 
  • EC fans with maximum energy efficiency for a high system efficiency
  • Adjustment of the air volume flow according to the cooling load via external controller (0 - 10 V)
  • Multi-fan units with intermediate plates (fan chambers) for optimum flow through the heat exchanger
  • High-performance heat exchanger with a low height and low interior volume
  • Optimised, aligned pipe system with smooth fins ensures low air-side pressure drop and high air flow rate

Corrosion protection

  • Corrosion-resistant aluminium housing with scratchproof powder coating
  • Corrosion protection for the heat exchanger and housing to withstand a range of environmental conditions
  • Stainless steel ceiling mounting integrated into the unit
  • Stainless steel housing (optional)
  • All corrosion protection variants at a glance


  • Large heat exchanger surfaces remove less moisture from the air and thus reduce the need for defrosting
  • Defrost safety thermostat interrupts electric defrosting if the defrost control system (accessory) malfunctions
  • MS coil heating rods for retrofitting at room temperatures above 0 °C


Find suitable accessories for the DHN

Thermal heating with protection grille

for extra dehumidification - can easily be retrofitted


Electronic e-valve and superheat controller for efficient, safe operation and quick start-up

Defrost safety thermostat

Switch contact opens at +25 °C and closes at +6 °C

Heating rods:

MS heating rods for coil defrosting (tR  > 0 °C) (IP66) - easily retrofittable

Filter attachment

in the air inlet with box

Insulated drip pan

prevents condensation forming

Further accessories

  • Various types of heat exchanger corrosion protection for use in aggressive environments
  • Heat exchanger for water or brine mode and CO2
  • AC fans
  • Stainless steel housing 


Order-picking warehouse - DHN/KVN - Klüvers

Order picking warehouses are particularly susceptible to the effects of air from outdoors which enters when the doors are open. To ensure that the cold chain is not interrupted high-performance air coolers which can cope with the resulting moisture are required. An effective defrosting system is particularly important here. The company Klüvers relies on DHN air coolers from Roller with their reliable and efficient defrosting system.

ApplicationOrder-picking warehouse
AddressNiendorf / Baltic sea - Germany
ProductDHN and KVN

Butchery cooling - DHN/FHV - Biaggini

High-quality meat and sausage products have a long tradition in the canton of Ticino (Switzerland), and preparation is still done with great passion. That's why these specialities are a real treat for the palate. In addition to the good ingredients and the know-how, the appropriate equipment is of course also required for the perfect result. The butcher's shop Bozzini in Biasca has invested in advanced refrigeration and counter technology and commissioned Biaggini to equip the refrigeration systems. The technology behind the attractive salesroom is all made by brand-name manufacturers. The DHN ceiling-mounted air cooler was chosen for hygienic and draught-free operation in the cutting room. In the two cold rooms, Biaggini relies on the tried-and-tested FHV cubic Roller air coolers, which not only ensure the correct temperature control but also the high quality of the chilled goods.

ApplicationCommercial Refrigeration
AddressBiasca / Swiss
ProductDHN & FHV

Fruit cooling - DHN- Coop Swiss

Correct refrigeration is crucial to how fresh the fruit and vegetables are when they reach the retailer's counters. An equal distribution of product-specific temperatures while maintaining the correct humidity levels are just as important as protection against other environmental influences. For this cold store for organic fruit and vegetables in Switzerland, our customer Biagginifrigoriferi used double-sided discharge CO2 ceiling aircoolers of type DHN.

ApplicationFruit and vegetable cooling
AddressBern - Swiss

Meat processing - DHN- Klüvers

When processing meat, quick and reliable cooling plays a key role in the quality of the final product. In addition, air coolers come under the hygiene concept of a company and must therefore meet the requirements of the HACCP concept. Easy cleaning is particularly important here. During cleaning, aggressive cleaning products are used and the air coolers need to be resistant to these. The company Klüvers relies on DHN air coolers from Roller with a full powder coating for optimum corrosion protection.

ApplicationMeat processing
AddressNiendorf / Baltic sea - Germany

Event catering - DHN - Taggenbrunn

The Taggenbrunn hotel requires reliable food cooling systems for its exclusive guest receptions and concerts. High-quality food and drinks and especially the wine collection must be cooled to the right temperature. The attractive air coolers from Roller fit in ideally in the castle architecture. The air coolers were delivered to the wholesaler Schiessl in Pörtschach straight from the factory.

AddressTaggenbrunn / Austria

Product documentation

Technical Data

All important technical data at a glance

Product name DHN
Capacity range 1,5 - 20 kW
Temperature range 0 °C to 50°C
Defrost heater Without
Tubes Internally grooved
Tube system Aligned
Number of fans 1 - 4
Fan type EC / forced / IP 54
Fan size 350 mm
Fin spacing 4 / 6 mm
Energy efficiency class A+ to B


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Tel.: +49 (0) 7156 / 2001-30