Holtop Computer Room Air Handler (CRAH) Solutions for Data Centers

What is a Computer Room Air Handler (CRAH) Unit?

A CRAH unit (Computer Room Air Handler) is an advanced air handling device specifically designed for crah data center environments. Unlike traditional CRAC (Computer Room Air Conditioning) systems that rely on mechanical refrigeration, crah units use a cooling coil supplied with chilled water from a chilled water plant to cool and dehumidify the air within the data center. This makes crah unit hvac solutions highly efficient and energy-saving for large-scale, mission-critical IT infrastructure. CRAH units can also modulate fan speed as needed, maintaining constant static pressure and ensuring stable temperature and humidity, protecting sensitive data center equipment.

Energy-Efficient Upgrades for CRAH Units

Over the past decade, crac and crah technologies have advanced significantly in energy efficiency, intelligent control, and ease of maintenance. Modern crah units data center systems commonly use electronically commutated motors (ECM) for variable-speed control, dynamically adjusting airflow and cooling according to the load for optimized performance. Enhanced air filtration and cleaning greatly reduce dust buildup, protecting equipment from contamination. The widespread deployment of environmental monitoring and smart sensors further improves data tracking and system adaptability. Updated humidity control strategies have also greatly reduced the need for built-in humidifiers, with standalone ultrasonic humidification now commonly used for precise humidity regulation.

CRAH Unit Installation Configurations

The efficient operation of a crah unit relies on scientifically designed installation configurations. Holtop’s engineering team is highly experienced in CRAH design and deployment for data centers and can recommend the optimal configuration for any scenario:

Down flow supply: Widely used in large-scale crah data center projects, the unit intakes air from the top, conditions it through the cooling coil, and delivers it from the lower frontal section—ideal for fan wall structures in data centers.

Up flow supply: Suitable for electrical rooms, IT rooms, etc.; air is drawn from the lower front, conditioned upwards through the cooling coil, and supplied from the top.

Frontal flow supply: Hot air enters through the lower front, is conditioned and released through the upper front—common in electrical switch and UPS rooms.

Under floor supply: The unit is installed beneath a raised floor, intaking hot air from the top, cooling it through the coil, and delivering conditioned air directly to the front of the racks via floor grilles—widely used in mainstream crah units data center applications.

Holtop Data Center Solution

Holtop provides high-performance, energy-saving crah unit and crah units solutions for data centers and IT facilities. We treat every crah data center project as a unique challenge, conducting comprehensive assessments based on facility size, layout, airflow, environmental standards, and budget. Holtop engineers design custom systems using the latest crac crah technology, whether upgrading existing setups or building new crah unit hvac systems from scratch, ensuring efficient and stable operation.

To ensure reliability and efficient operation, we also offer smart monitoring and maintenance programs, enabling precise zone control and supporting zero-fault, low-energy operation in your data center.

Why Choose Holtop for CRAH Solutions?

Reliability and efficiency are critical in the data center industry. With extensive experience in crac and crah system design, Holtop delivers durable, efficient, and scalable solutions for data centers and IT infrastructure. Our commitment to quality and innovation has made Holtop the first choice for clients seeking dependable crah unit and crah units for their critical operations.