Custom Indoor AHU

Customized. Efficient. Reliable.

STULZ is breaking new ground with its Indoor Air Handling Unit. The purpose-built solution meets users unique requirements for mission-critical environments by using proven STULZ technology.

Thanks to the new cooling concept the unit not only saves white space in large and hyperscale data centers but also makes highly efficient, reliable and performance-oriented operation possible without the need of a raised floor.


  • Large and hyperscale data centers

  • Free Cooling

  • Indoor installation

  • IT sector

  • Without raised floor

In collaboration with the customer, we develop the design concept, manufacture and deliver the optimal solution.


Customized Modular Design for Maximum Cooling Density

STULZ offers an extensive range of cooling capacities and systems, along with various unit configurations, designed to create the optimum solution for your individual requirements. With the STULZ Custom Indoor AHU, our customers receive a purpose-built solution that has been ideally configured for their application.

Explore Custom AHU Examples


Customized Modularity – Maximizing cooling density

STULZ Custom Indoor AHU is customizable to project-specific sizing and to various site conditions. The design concept with zero side access results in an increased cooling capacity per wall length. Furthermore the modularity increases the operational reliability through redundancy.



  • Low pPUE values

  • Best price-performance ratio

  • Taller racks and higher heat loads possible because no raised floor is needed

  • Supply air temperature within the range recommended by ASHRAE TC 9.9 guidelines

  • Lowest AER (Airflow Efficiency Ratio) values and therefore conduction with maximum efficiency

  • Use of EC technology for maximum efficiency


  • Compact footprint yet maximized cooling capacity

  • Higher efficiency and lower noise level

  • Robust, extruded aluminum construction with various panel thicknesses, including a thermal break option

  • Zero side clearance, space-efficient, modular design

  • Operational reliability and redundancy through modularity

  • Provides uniform cooling along the entire length of the aisle due to the larger area of supply air

Custom AHU Solutions Effective Airflow

STULZ E² Control and Monitoring

  • Designed specifically for precision control of mission-critical environments
  • Different operating modes for maximum efficiency and reliability
  • Multiple I/O capabilities for all major components to optimize control for energy savings
  • Controller UPS available
  • Suitable for connection to all common BMS systems

Fold-out fans for quick and easy maintenance and easily removable filters to ensure quick filter replacement.


  • All parts requiring maintenance can be accessed from the front

  • Quick installation

  • Factory trained and experienced sales and service partners in over 140 countries

  • Lowest total cost of ownership (TCO)

EC Fans

  • Speed-controlled fan
  • Nominal airflow rate at a fan speed optimized for partial load
  • UPS available for continuous fan operation
  • Multiple fan sizes available
  • Increased airflow in each size



Various valves available

PICV/Energy Valve

  • Dynamic load balance across all operating conditions

  • Eliminates problems associated with low delta T syndrome

  • Precisely matches design requirements for capacity and delta T

  • Maximizes energy savings of variable flow systems while addressing unique control challenges





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  • STULZ Air Technology Systems, Inc.

    STULZ Air Technology Systems, Inc.

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