Air Handling Units for indoor installation


Air Handling Units for indoor installation – for greater performance, energy efficiency and redundancy

Breaking new ground
When it comes to large and hyperscale data centers, conventional air conditioning systems are up against their limits. Restricted space, electricity consumption and high heat loads are some of the challenges that need to be overcome. STULZ offers solutions to these challenges and guarantees efficient, demand-based and reliable air conditioning of your mission-critical equipment. Our solutions' unique design allows space for taller server racks with greater IT load densities, therefore enabling air conditioning of the maximum heat load.



  • Reliable air conditioning of taller racks and higher heat loads

  • Large air throw for uniform cooling of large server rooms

  • Units with Free Cooling option enable maximum potential savings

  • Low pPUE values achievable

  • Extremely low AER (Airflow Efficiency Ratio) values thanks to minimal pressure drops

  • Small footprint with maximum cooling capacity

  • Low noise level

  • Modular design ensures redundancy

  • Easy access for maintenance purposes

  • Comprehensive service in over 140 countries worldwide

A new cooling concept for air conditioning maximum heat loads

Kühlkonzept Wärmelasten

1. No raised floor required

2. The entire cold aisle is air conditioned

3. Wall-mounted installation with horizontal air conduction

4. Hot aisle containment

5. Taller racks

6. Return air duct

7. Service corridor

8. Air Handling Units

Cooling concept

Design concept
  • Small footprint with maximum cooling capacity
  • Taller racks and higher heat loads are possible, as no raised floor is required
  • Larger supply air area for a high air flow rate at low air velocity and uniform air conditioning
    along the entire cold aisle
  • Optional dampers prevent air recirculation
  • Low noise level thanks to optimized air conduction and low pressure drops
  • Systems can be adapted to the project-specific room size and different site conditions
  • Modular design enables efficient utilization of space and increases operational reliability through redundancy
  • Higher cooling capacity per wall length: thanks to the design concept, units can be positioned directly next to each other


Installation and Service
  • Modular design for fast and easy installation
  • All maintenance can be performed from the service corridor
  • Experienced sales and service partners with in-house training are located in over 140 countries
Energy efficiency
  • Low pPUE values achievable
  • Designed for high supply and return air temperatures within the range recommended by the ASHRAE-TC-9.9 guidelines
  • Exceptionally low AER (Airflow Efficiency Ratio) values and therefore maximum efficiency in terms of air conduction
  • Maximized heat exchanger surfaces for high chilled water temperatures and minimal pressure drops
  • Hot aisle containment for physically separating the hot and cold air, to completely prevent the airflows from mixing
  • EC fan technology for maximum efficiency
  • Lowest total cost of ownership (TCO)


Perfect hydraulic coordination of liquid cooling systems thanks to pressure independent control (PIC) valve

  • Automatic hydraulic compensation
  • Precise, stable operation whatever the heat load
  • Reduced energy consumption of pumps in the chilled water system
PIC valve
Maximum added value with our self-developed control system

We strive to bring you added value. Perfect coordination of the controller, software and air conditioning units brings you additional reliability and efficiency. We therefore develop our own hardware and software in a holistic and integrated overall process – to exploit the maximum possible benefits for you.

  • Built-in added value: Our controllers are designed for controlling and monitoring air conditioning systems and for the parallel operation of several machines.
  • Intelligent control system: Optional sequencing with standby functions enables individual air conditioning modules of a group to be used to a greater or lesser extent with the utmost flexibility.
  • Reliable documentation: Monitoring and reporting in addition to recording the indoor climate
  • Maximum flexibility: Compatible with all common BMS protocols
  • Maximum performance: The controllers enable the centralized control of up to 20 air conditioning modules per group.
The complete solution

Our Air Handling Unit solutions for indoor installation are more than just products. We offer you a complete service portfolio – a turnkey solution for cooling your data center:

  • Worldwide, professional service
  • Start-up
  • Maintenance
  • Optimization of operations
Service technician
Close to you around the world

As a company with sites around the globe, we are able to offer everything that data center operators, planning engineers and businesses in the extremely dynamic ICT and IT world require – plus professional advice at the right time and the right place.

Our trained and experienced sales and service partners are available in over 140 countries. The resulting proximity to our customers enables rapid reaction times. What’s more, regular training sessions and a lively exchange of information ensure high quality and a comprehensive knowledge of all our products.

This way, you can be sure that your products are in the best hands and receive the right service – anywhere in the world.



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