Cooling Tower Fan Array Retrofit with Built-In Redundancy
Upgrade aging cooling towers with modular fan array systems designed to improve efficiency, reduce maintenance, and lower the risk of failure.
Refurbish Existing Towers with Modern Technology
For over two decades, Mainstream has supplied fan array systems for air handling units to improve efficiency, add redundancy, and bring new life to aging equipment. Mainstream now applies that same approach to cooling towers with a retrofit solution built to extend tower life, improve reliability, and simplify maintenance.
Cooling Tower Fan Arrays are designed to replace older belt-driven fan arrangements with modular, direct-drive fan systems and integrated controls. The result is a more modern cooling tower upgrade path that helps reduce downtime, improve controllability, and avoid the disruption and expense of a full tower replacement.
Why Retrofit a Cooling Tower with a Fan Array?
Mainstream's Cooling Tower Fan Arrays bring proven fan array technology to the cooling tower market — extending equipment life while minimizing downtime and maintenance costs.
Extend the Life of Existing Towers
A fan array retrofit gives aging cooling towers a practical modernization path, helping owners continue using existing assets while reducing the risk of fan system failure.
Add Redundancy
With multiple fans operating as one system, the risk of a single fan failure is significantly reduced. N+1 redundancy is also available for projects where additional protection is required.
Improve Efficiency
Efficient motors and precise turndown and control can improve tower efficiency without requiring major structural changes to the tower itself.
Reduce Maintenance and Downtime
Direct-drive fans eliminate belts, pulleys, and old gearboxes — reducing ongoing maintenance requirements and helping minimize unplanned downtime.
Quiet Operation
Smaller fans and variable speed operation help reduce noise and create smoother, more consistent performance — especially valuable in sound-sensitive environments.
Cooling Tower Fan Array Features
Mainstream's cooling tower retrofit fan arrays are designed to deliver a complete, application-ready solution with everything needed for reliable outdoor operation.
- Modular design for simpler installation
- Built-in redundancy, with N+1 redundancy available
- Energy-efficient motors with precise turndown and control
- Zero routine maintenance — no belts, pulleys, or gearboxes
- Integral controls with single-point power panel
- BMS integration included
- Quiet, smooth, variable speed operation
- Hot-dipped galvanized construction for outdoor exposure
- TEAO, IP66-rated motors for severe environments
Designed for a Wide Range of Cooling Tower Retrofits
Mainstream's Cooling Tower Fan Arrays are not limited to a specific OEM or tower design. Mainstream offers a range of variations to fit most towers, making this solution well suited for facilities looking to modernize existing cooling towers, reduce operational risk, and improve long-term serviceability.
Why Choose Mainstream?
Mainstream has delivered custom HVAC solutions for more than 30 years, with broad capabilities, product range, and flexibility that support application-specific retrofit work. All Mainstream products are made in America.
For cooling tower retrofits, that means a solution provider that understands custom equipment, real-world installation constraints, and the importance of reliable performance in critical systems.
30+ Years of Experience
Decades of custom HVAC engineering, now applied to the cooling tower market.
American Made
Manufactured at our Berkeley Heights, NJ facility. AMCA certified.
Custom-Built for Each Application
No off-the-shelf solutions — every system is engineered around your tower and project requirements.
Cooling Tower Fan Array Retrofit Process
A tower retrofit is a four-step job, and the sequence is what keeps downtime inside a scheduled window rather than an open-ended one.
- Site assessment and field measurement. We measure the existing fan, motor, drive and the opening they sit in, and confirm the airflow and static pressure the tower actually needs. Nothing gets engineered off a nameplate alone.
- Custom fan array engineering. The array is laid out around those measurements — fan count, motor type and control strategy chosen for the tower’s duty, with spare capacity built in where the site cannot tolerate an outage.
- Fabrication. Built in our own shop, so dimensions and delivery stay under our control rather than a third party’s.
- Installation with minimal downtime. Because the array ships as modules that pass through existing access points, the tower does not have to be dismantled to get the new fans in.
Retrofitting rather than replacing keeps the tower structure, basin and fill in service, which is the bulk of what a new tower costs. The fan side is where the energy and reliability gains are. For the redundancy side of the design, see HVAC redundancy; for the full range of configurations we build, see our fan arrays page.
Cooling Tower Retrofit FAQs
How long does a cooling tower fan array retrofit take?
Standard fan array lead time is 10 weeks or less from approved drawings, and expedited jobs have shipped in under two weeks. Installation is scheduled around your outage window: the array arrives as modules that fit through existing access points, so the tower does not have to be opened up the way a single large fan replacement requires.
Challenge
An aging cooling tower system was operating with two large fans, creating a familiar set of risks: limited redundancy, higher maintenance demands, and reduced efficiency. If one fan went down, system performance was significantly impacted — increasing operational risk and putting added pressure on maintenance teams.
Solution
Mainstream supplied a modular fan array system made up of 16 direct-drive fans. The new configuration introduced built-in redundancy, eliminated belts, and provided a more controllable, efficient airflow solution without requiring a full cooling tower replacement.
Results
Redundancy increased by eight times — dramatically reducing operational risk.
Significant energy efficiency improvements demonstrated in the first phase.
Smoother, quieter operation with reduced maintenance requirements — accelerating the decision to proceed with a second phase.