Series HTC: Counter Flow

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Counter Flow Heat Exchangers

VoltAire’s HTC Counter Flow series provides a narrower width to accommodate placement on smaller doors or equipment. It also offers a quieter design.

The counter flow cores allow design capacity to be achieved with heat exchanger depth and height, rather than cross flow cores, which generally require additional width to increase capacity.

Best yet, for outside plant facilities in residential or light commercial areas, the slower airflow and lower decibel axial fans improve noise levels greatly. The HTC line is available in 15, 20, 25, 42, and 90 watts per degree Fahrenheit and available in 48VDC, 115VAC and 230VAC.


UL 1995 and NEMA 4 (4X)

UL recognized-69

Standard Features

  • UL Recognized
  • High-performance fans with a minimum IP rating of 42
  • Fan speed and alarm control board
  • Closed-loop certified NEMA 4 (4X) cooling for outside plant applications
  • Epoxy-coated aluminum counter-flow core
  • Designed in accordance with GR-487 specifications
  • Stainless steel hardware
  • Powder coated cosmetic aluminum cover
  • Corrosion resistant Acrylume enclosure

Optional Features

  • Stainless steel cover
  • Custom paint finishes


  • Radio base stations
  • Telecom shelters and indoor / outdoor OSP cabinets
  • Network switching rooms and computer rooms
  • Automation control cabinets, process control centers
  • Solar cabinets
  • Power distribution cabinets
  • Digital advertisement boards, kiosk display systems
  • Power supply cabinets, battery cabinets, and rectifier cabinets
  • CNC machines
  • Drive cabinets
  • Mining equipment
  • Oil and gas equipment

Proudly Engineered, Tested, and Manufactured in the USA

Technical Data

Cooling Capacity15W/°F
Operational Temperature (°F / °C)-40 to 158 / -40 to 70
Sound at 3m (dBa)5156646668
Electrical Data
Voltage Input48VDC
Current Draw (amps)
Unit Dimensions
Height (in/mm)20.0 / 50823.9 / 60746.3 / 1176
Width (in/mm)12.3 / 31218.0 / 45719.4 / 493
Depth (in/mm)7.6 / 1938.0 / 20311.3 / 287
Weight (lbs/kg)22.0 / 1036.5 / 1686.1 / 39

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