Factory Assembled


The Marley MD is a factory assembled counterflow cooling tower. For many HVAC and light industrial applications, this design requires less plan area and offers greater site placement flexibility than a comparable crossflow cooling tower. A broader box size selection and more design options have expanded the range of the versatile MD product line. New back-to-back installation configurations for all models provide even more site placement adaptability. Optional mechanical access platforms are now available factory assembled or field installed, allowing safe access to the mechanical system, water distribution system, fill and drift eliminators. 

Where space is limited or otherwise restricted, a counterflow cooling tower may be a perfect fit. In addition to taking up less site space, counterflow cooling towers may have a lower installed weight. Plus, piping costs can be reduced since a single inlet is usually standard. Triple-pass inlet louvers limit the sunlight entering the collection basin, reducing the potential for algae growth. Counterflow cooling towers offer easy access to the collection basin from all sides. The wet surface is totally enclosed for protection from environmental elements, and the MD cooling tower utilizes a corrosion-resistant spray system.

Unmatched Reliability Heavy-duty construction, high-performance design, and our five-year mechanical warranty ensure consistent, fully rated cooling over a wide range of flow and temperature requirements.

Smaller Footprint Induced draft counterflow cooling tower design requires less plan area than crossflow cooling towers for many HVAC and light industrial duties. And because the cooling tower’s size typically results in less steel used, its reduced weight requires less support structure.

Low Energy Consumption Induced draft counterflow mechanical equipment minimizes the energy consumption by providing a lower fan energy requirement than centrifugal fan counterflow cooling towers.

Ease of Maintenance SPX Cooling Technologies has worked hard to address the maintenance difficulties long associated with counterflow cooling towers. Our MD cooling tower provides larger access doors, easily removable block fill and other features that simplify maintenance.

Low Sound The CTI-Certified Marley MD cooling tower comes standard with our low sound fan, suitable for most noise-sensitive situations. Multiple fan and attenuation options are available to meet more stringent sound requirements.

Independently Validated Sound Data Marley towers are the only package cooling towers tested per CTI ATC-128 test code by third-party CTI-licensed test agents and certified acoustical engineers. MD sound levels are independently verified to meet published sound levels.

Superior Water Management To address the “splash-out” problem typically found in other manufacturer's counterflow cooling tower designs, SPX introduces an industry first: a triple-pass inlet louver that conserves water and improves winter operation.

What makes the Marley counterflow cooling tower stand out from other manufacturers?

Triple-pass inlet louvers and drift eliminator for superior splash-out protection and water conservation

SPX's position as "sole source supplier" for all configurations of cooling towers and fluid coolers

The Marley reputation. Our brand name. Our service. Our position as an undisputed industry leader in product quality.

Air Movement Package

High efficiency fan - wide-chord design for maximum efficiency at low fan tip speeds.

Eased inlet fan cylinder - ensures full area, low turbulent airflow through the cylinder.

Spherical roller bearings are rated at an L10 life of 100,000 hours.

TEFC Fan Motor 1.15 service factor, variable torque, and specially insulated for cooling tower duty for extended life.

The MD Series air movement package including the structural support - guaranteed against failure for a period of five full years.

Water Distribution System

Pressurized spray distribution distributes water evenly over the fill.

Low-clog polypropylene nozzles - deliver precise distribution of water over the fill area.

Marley MC thermoformed PVC film fill assembled into packs for easy removal and cleaning.

Marley XCEL drift eliminators - limit drift losses to no more than .001% of the design flow rate.


Induced-draft counterflow design may require less plan area than crossflow cooling towers typically use.

Steel Construction - heavy mill galvanized steel construction standard. Series 300 stainless steel optional.

Factory assembly – ensures final field installation will be hassle-free.

Triple-pass PVC inlet louvers – limit splash-out and eliminate sunlight from entering the cooling tower collection basin.

Quality Parts

High Efficiency Axial Fan - Adjustable pitch fan blades permit the maximum utilization of rated horsepower and optimal cooling tower performance.

Premium Efficiency Fan Motor TEFC 1.15 service factor, vertical-shaft motor designed to Marley specifications for cooling tower duty. Specially insulated for humid cooling tower service.

Five-Year Mechanical Warranty - Five-year total mechanical equipment warranty including mechanical equipment support.

Value-Added Options

Marley System 5 Geareducer Drive – Requires no oil changes for five full years, the lowest maintenance requirements in the industry. Fewer oil changes reduce waste stream and environmental impact. Independent tests prove Marley Geareducer is up to 12 dBA quieter than gearboxes used by other cooling tower manufacturers.

Welded Stainless Steel Collection Basin – For extra protection, all collection basin parts exposed to the circulating water (including structural members that project into the basin) and all basin options are heavy-gauge 300 stainless steel.

Mechanical Access Door Platform - The steel structure and bar grating are attached to and supported by the cooling tower, allowing access to the mechanical system, drift eliminators, distribution system and fill. Available factory assembled or for field installation. 

Ultra Quiet Fan – wide-chord acoustic geometry fan maximizes efficiency while significantly reducing sound levels.  Fan is constructed of lightweight and durable, corrosion and fire resistant marine grade aluminum.

Sound Attenuation – splash attenuation media installed in the collection basin reduces falling water noise effectively and economically.  Fan outlet attenuation is also available.

Basin Sweeper Piping - factory installed sweeper piping helps to limit dirt and debris buildup in the collection basin, augmenting system filtration.

Control Systems - range in sophistication from standard fan starters and disconnects to Programmable Logic Controllers that work in conjunction with your building or process system.

Variable Speed Drive - provides the ultimate in temperature control, energy management, sound control and mechanical equipment longevity.

Solid State Water Level Control Package - monitor basin water level with solenoid-valve water makeup. Optional configurations include makeup, high water level alarm, low water level alarm, high and low level cutoffs, and electric basin heater cutoff.

Electric Basin Heater - a stainless steel electric immersion heater employs a magnetic contactor and solid-state circuit board to help prevent freezing during cold weather.

  • Availability: Worldwide
  • GPM Range: 352 - 30120
  • 89 - 756 tons per cell

  • CTI Certified

  • Eurovent Certified

  • ASHRAE 90.1 compliant

  • OSHA compliant

  • Rugged G235 (Z725) galvanized steel is standard with 300 series stainless steel as an optional upgrade to part or the entire cooling tower structure

  • Triple-pass inlet louvers and drift eliminators that conserve water and improve winter operation

  • 5 year mechanical warranty


From factory assembled systems for HVAC applications to field erected towers for power and industrial operations, SPX Cooling Technologies can help you realize greater productivity and efficiency.


Marley Cooling Tower Parts