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Critical labs demand critical solutions: Oxford University’s AHU retrofit success


When mission-critical facilities can’t afford downtime, traditional single- point-of-failure HVAC systems become unacceptable risks. The University of Oxford’s Environmental Sciences and Materials Facility faced exactly this challenge, and their solution demonstrates why forward-thinking facilities are increasingly turning to multiple fan array retrofits


Legacy systems, critical consequences


Oxford’s existing double-inlet fan system epitomised the vulnerability of older HVAC designs. Two motors, two belts, one catastrophic failure point. For laboratories where air quality directly impacts research integrity and safety, this configuration represented an operational liability that demanded immediate attention. Beyond reliability concerns, the aging system struggled with declining energy efficiency, increasing maintenance complexity, and limited integration with modern building management systems.


The strategic solution, fan wall technology


Rather than perpetuate outdated approaches with like-for-like replacement, the project team specified a comprehensive multiple-fan-array retrofit. Six Rosenberg I-Wheel 450 EC plug fans were integrated into a custom pre-manufactured framework. The Modbus-ready installation exceeded standard N+1 redundancy requirements, providing true operational flexibility while future-proofing the system for decades of reliable service.


Expertise under pressure


Retrofit projects in active facilities demand specialist experience. Oxford’s challenges included restricted access areas where standard platforms couldn’t reach deteriorated flex ducting, requiring innovative desk-surfer platform solutions. The new AHU layout necessitated lighting circuit modifications, demanding careful trade coordination to maintain safety while keeping schedules on


Perhaps most importantly, distributed failure points replace catastrophic single-point vulnerabilities. For facilities managers evaluating AHU retrofit


track. Throughout the project, site activities were coordinated around university schedules, ensuring research operations continued uninterrupted. The collaborative approach between Axair, a


wide range of varying discipline contractors, and university facilities management demonstrated how experienced contractors navigate complex retrofit environments where operational continuity is paramount.


Measurable outcomes


The six-fan array eliminated single points of failure while providing unprecedented operational flexibility during maintenance periods. EC plug fan technology delivered significant energy savings compared to the legacy belt-driven system, while upgraded BMS integration provided real-time monitoring and seamless laboratory safety system connectivity. Complete ductwork renewal and improved electrical arrangements further reduced operational risks across the facility.


Industry transformation


Oxford’s project reflects broader industry recognition that multiple fan array technology offers compelling advantages over traditional systems. True redundancy through multiple smaller fans provides genuine backup capability, while individual fan servicing eliminates the need for complete system shutdowns. Variable capacity matching optimises energy consumption, and modular design accommodates future requirement changes.


18 December 2025


options, Oxford’s project highlights the importance of specifying redundancy levels appropriate for truly critical applications, ensuring modern BMS connectivity isn’t treated as optional, and recognising that retrofit complexity often exceeds initial expectations. The selection of contractors with proven multi-trade coordination experience becomes essential, as does planning for future flexibility through Modbus and other connectivity options.


The retrofit advantage


Traditional HVAC replacement often focuses on minimal disruption and basic functionality restoration. However, retrofit projects present opportunities to fundamentally improve system reliability, efficiency, and capability. Oxford’s transformation from vulnerable legacy equipment to robust, redundant, future-ready infrastructure exemplifies this approach. For critical facilities where system failure carries


significant operational and safety consequences, multiple fan array retrofits represent both immediate risk mitigation and long-term strategic advantage. As more facilities recognise these benefits, fan wall technology is rapidly becoming the preferred solution for demanding applications. Critical facilities across the UK are discovering


how this technology transforms HVAC reliability and efficiency. Whether managing laboratories, clean rooms, data centres, or other mission- critical environments, the right retrofit expertise delivers solutions tailored to specific operational requirements.


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