Ventilation and Cooling for Containers, Cabinets and Enclosures

Closed boxes trap heat and moisture. A shipping container used as a store or site office gets hot in the sun and suffers from condensation. A control cabinet, telecom enclosure or battery container holds electronics that produce heat and fail early if they run too hot. The right fan removes the heat while keeping out rain, dust and insects.

This section collects LONGWELL’s guides for ventilating and cooling enclosed spaces, from whole containers to small electronic devices.

Applications in this section

Shipping containersWall exhaust fans, solar roof fans and cooling fans for storage containers, site offices and equipment containers. Control cabinets and electrical panelsDC, AC and EC fans for panels, cabinets and VFDs.

Related guides

Electronics and device coolingSmall DC fans and blowers for power supplies, screens and devices. Telecom cabinet coolingFan cooling for outdoor telecom cabinets. Closed-cabinet heat exchangersAir-to-air heat exchangers for sealed enclosures. Telecom shelter free coolingUsing outdoor air to cool equipment shelters. PV inverter coolingInternal fans for solar inverters. Crypto mining containersHigh-volume exhaust for miner rooms and containers. Battery energy storageThermal management airflow in BESS containers.

How to choose an enclosure fan

Start from the heat load

Add up the heat from the equipment inside and add solar gain for outdoor enclosures. Required airflow (m³/h) ≈ 3.1 × heat load (W) ÷ allowed temperature rise (K).

Open ventilation or closed cooling?

Filtered fans exchange inside air with outside air and work when the outdoor air is cool and clean enough. Where dust, salt or high humidity must stay out, use a closed system such as an air-to-air heat exchanger or air conditioner, with fans circulating air inside.

Protect the openings

Use filters, weather hoods, rain louvres and insect screens on inlets and outlets, and allow for their resistance when sizing the fan.

Power and control

Choose DC, AC or EC fans to match the supply, and use temperature control or alarms where equipment uptime matters.

Fan families

• DC axial fans and compact axial fans
• AC axial fans and EC axial fans
• Wall exhaust fans
• Solar roof fans

Download: DC electronics cooling fan catalogue · AC electronics cooling fan catalogue · EC electronics cooling fan catalogue

What to include in your enquiry

• Enclosure type and size; indoor or outdoor
• Heat load of the equipment and maximum allowed internal temperature
• Outdoor conditions: sun, dust, rain, salt
• Supply voltage (DC or AC); control and alarms
• Quantity and mounting space

Send your enclosure cooling requirements →

FAQ

How do I calculate the fan size for a cabinet?

Airflow (m³/h) ≈ 3.1 × heat load (W) ÷ allowed temperature rise (K). Then add margin for filter resistance and choose a fan that delivers that airflow at the expected pressure.

How do I stop condensation in a shipping container?

Ventilation that exchanges the moist inside air with outside air, for example a wall exhaust fan with a vent or a solar roof fan, reduces condensation. Insulation also helps.

Can LONGWELL supply fans for enclosure manufacturers?

Yes. LONGWELL supplies DC, AC and EC fans to cabinet, container and equipment builders, including OEM versions.