A mid-sized enterprise data centre had been in continuous operation for several years without a structured cleaning programme in place. Routine maintenance visits had highlighted a growing accumulation of dust and debris within server racks, under raised floor panels, and across cooling unit filters - raising concerns around equipment reliability, cooling efficiency, and compliance with the organisation's internal infrastructure standards. The client engaged an experienced infrastructure team to perform a full data centre cleaning, covering all physical layers of the environment - from the raised floor void through to active rack equipment - and to establish a baseline standard for ongoing contamination control.
Operational environment - the data centre was live and in production throughout the engagement, requiring all cleaning activity to be carried out without powering down active equipment or disrupting running services.
Dust accumulation in racks - years of operation without structured cleaning had resulted in significant dust build-up on server intakes, fan assemblies, and cable bundles, contributing to elevated operating temperatures on several devices.
Raised floor contamination - the underfloor void contained accumulated dust, debris, and in some areas remnants of old cabling offcuts left from previous infrastructure changes, partially obstructing airflow from floor grilles.
Cooling unit filters - CRAC/CRAH unit filters were heavily loaded, reducing cooling efficiency and increasing the risk of hot spots within the hall.
ESD and equipment safety - all cleaning activity in proximity to live equipment required strict adherence to electrostatic discharge (ESD) precautions and the use of appropriate antistatic tools and materials.
Conducted a pre-clean inspection of the entire data centre environment, documenting the current state of cleanliness across all areas - rack interiors, top-of-rack surfaces, cable trays, underfloor void, and cooling units.
Produced a cleaning scope document and work plan, dividing the engagement into clearly defined zones and scheduling activities to minimise proximity to the most sensitive live equipment.
Confirmed all required materials and equipment: ESD-safe vacuum cleaners with HEPA filtration, antistatic cleaning cloths, compressed air (ESD-safe), raised floor panel lifters, CRAC filter replacements, and appropriate PPE (lab coats, gloves, hair covers, overshoe covers).
Briefed the client's operations team on the planned scope and agreed access windows for raised floor work and cooling unit maintenance.
Systematically lifted raised floor panels section by section, photographing the underfloor conditions before and after cleaning in each zone.
Removed all loose debris, dust accumulations, and legacy cabling waste from the underfloor void using HEPA-filtered vacuum equipment.
Cleaned the underside of raised floor panels and the tops of floor support pedestals.
Verified that all underfloor cable runs and power distribution remained undisturbed throughout, and confirmed that perforated floor tile positions were correct for the room's airflow management design.
Reinstated all raised floor panels securely after cleaning each section.
Working methodically through each rack, cleaned all external rack surfaces - top panels, side panels, doors (front and rear), and rack frames - using antistatic cloths.
Using ESD-safe HEPA vacuum equipment and low-pressure ESD-safe compressed air, removed dust accumulations from:
Server front bezels and air intake grilles
Rear exhaust areas and fan assemblies (without removing equipment from racks)
Patch panel surfaces and cable management fingers
Switch and router ventilation slots
PDU (Power Distribution Unit) surfaces and sockets
Cleaned the internal base and top of each rack, removing any debris that had settled over time.
Avoided direct contact with any live connectors, exposed PCBs, or active cable terminations throughout, in strict compliance with ESD safety protocols.
Photographed rack interiors before and after cleaning to document the improvement for the client's records.
Inspected all CRAC/CRAH unit external panels and surrounds, cleaning surfaces with antistatic cloths.
Removed and replaced heavily loaded air filters on all cooling units, disposing of old filters in sealed bags to prevent re-contamination of the environment.
Cleaned accessible external coil faces and return air grilles using low-pressure compressed air and HEPA vacuum equipment.
Recorded filter replacement dates and filter specifications for inclusion in the client's maintenance log.
Cleaned overhead cable trays and containment runs throughout the data centre hall, removing accumulated surface dust using HEPA vacuum and antistatic cloths.
Inspected and cleaned ventilation grilles and diffusers at ceiling level where accessible.
Removed any loose tie-wrap offcuts, labels, or legacy debris found on cable trays during the cleaning sweep.
Conducted a post-clean walkthrough of the entire environment with the client's facilities representative, reviewing before-and-after photographs for each zone.
Confirmed all raised floor panels were correctly seated, all cooling unit filters had been replaced, and all racks had been returned to their original state.
Delivered a cleaning completion report to the client including:
Before and after photographic record for each zone
Filter replacement log (unit reference, old filter condition, replacement date and specification)
Summary of findings - any items of concern noted during cleaning (e.g. damaged blanking panels, unsealed cable penetrations, equipment running at elevated temperatures) with recommendations for remediation
Recommended cleaning frequency schedule for ongoing contamination control
The data centre cleaning engagement was completed within the agreed timeframe with no disruption to live services. Key results included:
Visible and measurable improvement in rack cleanliness across the entire environment, with before-and-after photographs demonstrating the reduction in dust loading on equipment.
Cooling efficiency restored following CRAC/CRAH filter replacement, with the client's monitoring platform showing a reduction in average rack inlet temperatures in the days following the engagement.
Underfloor airflow improved after removal of debris and legacy waste material from the raised floor void, contributing to more consistent cold aisle temperatures.
Findings report delivered, identifying several blanking panel gaps and unsealed cable floor penetrations that were allowing hot/cold air mixing - providing the client with a prioritised remediation list beyond the cleaning scope.
A recommended cleaning schedule was agreed with the client, establishing quarterly rack and surface cleaning and biannual underfloor and cooling unit maintenance as the ongoing standard.
HEPA-filtered ESD-safe vacuum equipment
ESD-safe compressed air tools
Antistatic cleaning materials and PPE
Raised floor panel management
CRAC/CRAH filter inspection and replacement
Before/after photographic documentation
Data centre airflow management awareness
Cleaning completion reporting and maintenance scheduling
Live environment working procedures and ESD safety compliance
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