Data Center Cooling | Armstrong | Americas

Achieve more effective, dependable cooling and precise control of relative humidity with EvaPack™ from Armstrong International.

Boost your efficiency and lower your PUE with EvaPack™, Armstrong’s best-in-class data center cooling and humidification solution. Our dependable, low-maintenance evaporative pad humidifier ensures effective cooling and precise control of relative humidity in your data center, while reducing energy use for substantial cost savings.

EvaPack™ is Simple, Smart and Adaptable

  • Installation is quick and easy
  • Works with various types of water, including: potable, reverse osmosis or soft
  • Compact design has a maximum footprint of 236.2 in [600 mm]
  • 23.6 in [60 cm] depth including droplet separator
  • No absorption distance
  • Water connections are on the side
  • Draining and overflow connections: 1.5 in [40 mm]

Energy Savings and Efficiency

  • Designed to maximize efficiency and minimize pressure drop.

Example: For a 294,288.8 CFM [500 000 m3/h] airflow, a pressure drop difference of 0.2”WC [50 Pa] represents a saving of 67,500 kWh per year ($7,630.88 [6,750€]/year at $.01 [0,01€]/kWh).

  • EvaPack™ uses heat present in the air for humidifying and cooling, resulting in lower energy consumption
  • Optimized to provide the highest air/water contact surface—up to 12% more than traditional evaporative pads

The Optimized Water Contact Surface Helps Achieve a Low PUE

EvaPack™ energy consumption:

+ 0W to 250W

PUE =        Total Facility Energy                 
IT Total Equipment Energy

Designed for Flexibility and Customization

  • Size and configuration can be tailored for your requirements
  • Available for AHU, duct, fan wall, direct or recirculated water applications
  • From approximately 3.8 ft2 to 96.8 ft2 [0.36 mÇ to 9.00 mÇ] in one piece assembly. 
  • Low-maintenance, Easy to Clean and Service
  • Cassettes are accessible from the side, or from the front for larger sizes, which reduces the requested replacement space. Cassette maintenance can be finished within seconds.
  • Water pump, water level detector, and manual gate valves are accessible on the service side for simplified maintenance. Elements are easy to disassemble, clean, and reassemble.

Safe, Hygienic and Efficient

  • No glue or hazardous substances
  • No fiber loss
  • Encrusted silver ions prevent bacterial proliferation
  • Fireproof
  • High moisture absorptive capability
  • Minimum pressure drop

Precise Control and Water Savings

In direct water configuration with a reverse osmosis (RO) water supply, EvaPack™, used in conjunction with Armstrong’s wide rangeability water valves, allows proportional control of humidification by injecting the exact quantity of water needed for the cooling process—with no wastewater.

Products and Systems for Data Centers

EvaPack™ Series Certifications


  • Contains no harmful substances. Complies with the Directive Restriction of Certain Hazardous Substances (RoHS) 2011/65/UE (2002/95/CE). Based on independent tests carried out by SGS Consumer Testing Services (IAS accredited).
  • UL GREENGUARD Gold Certification ensures that EvaPack™ meets stringent, health-based criteria designed to help prevent exposure to harmful chemical emissions and VOCs in indoor environments.*
  • No fiber loss in the air flow from EvaPack™ evaporative pad. Based on independent tests carried out by SP Technical Research Institute of Sweden.


  • EvaPack™ evaporative pads are noncombustible according to Euro Class A1. Based on EN ISO 1716:2011 and UNE EN ISO 1182:2011 independent tests carried out by Applus+Laboratories.
  • EvaPack™ Evaporative Pads are UL Certified Standard 900 for air filters, ensuring that the amount of smoke generated, and the combustibility of air filter units, are within UL standards.*

*Underwriters Laboratories (UL) is a global, not-for-profit safety science company, and the largest and oldest independent testing laboratory in the United States.

Humidification Solutions

Products for Health and Humidification


  • Designed according to VDI 6022 Hygienic standards. All nonmetallic parts fulfil requirements from the VDI 6022, Part 1 (04/2006) in microbial inertness and are suitable for use in HVAC systems. Based on EN ISO 846 independent tests carried out by IHL BERLIN Institute for Hygiene.