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Air coolers for chilled, frozen and low-temperature rooms

Fin spacing is the first decision, not capacity. A cooler sized for a chilled room will ice up within days at −18°C, because the gap between fins cannot pass the frost.

Fin spacing follows the room temperature

Three series cover the normal range. The difference between them is the gap between fins, and that gap is set by how much frost the room will produce.

Room temperatureSeriesFin spacingWhy
Around 0°CDL · high temperature4.5 mmLittle frost; closer fins give more surface in the same box
Around −18°CDD · medium temperature6.0 mmModerate frost; 4.5 mm would bridge within weeks
Around −25°C and belowDJ · low temperature9.0 mmHeavy frost; wider gaps and larger defrost capacity

Fin spacing is not a preference. Choosing a closer pitch to save space means shorter intervals between defrosts, and eventually a cooler that cannot clear itself.

Model range

SeriesModelsCapacityCooling areaFans
DL high temperatureDL20 – DL2604.2 – 55 kW20 – 260 m²2 – 4 × Ø300 – 500
DD medium temperatureDD15 – DD2002.6 – 40 kW15 – 200 m²2 – 4 × Ø300 – 500
DJ low temperatureDJ seriesto 68 kWup to 400 m²2 – 4 × Ø500

Full model tables with cooling area, airflow and dimensions are supplied with the quotation. Capacity is stated at a defined evaporating temperature and temperature difference — it is not a single fixed number.

What is inside

Ceiling unit coolers
Ceiling unit coolersFan guards and hangers visible on the finished unit
Panel and coil work
Panel and coil workCoils and panels built in the same workshop

Unit cooler questions

Why not use one fin spacing for every room?
Because frost bridges the gap. At −18°C a 4.5 mm pitch fills within weeks and the cooler stops transferring heat; at 0°C a 9 mm pitch wastes surface area and makes the unit larger than it needs to be.
Electric or hot-gas defrost?
Electric defrost is the default for freezers; hot-gas is used where energy or pull-down time matters and the plant can support it. The choice is made with the unit selection, not after installation.
Can the cooler be supplied for a corrosive room?
Yes — stainless housing and coated coils for seafood and curing rooms, where salt and humidity shorten the life of a standard casing.

Send the room conditions

Product, room temperature, tonnage and daily throughput — enough to come back with a selection and an indicative price.

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