Specialists in Data Centre Cleaning

FACILITIES ENGINEERING | CRITICAL INFRASTRUCTURE

Data Centre Sub-floor & Plenum Cleaning

Thorough cleaning of raised-floor voids, plenums and cable trays to restore airflow, reduce hot spots and remove the dust loads that drive thermal alarms.

Document Type: Facility Service Specification Version: 1.0

Prepared for: Classification: Internal

1 Purpose & Service Overview……………………………………………………………………………………….. 3

2 Scope of Services………………………………………………………………………………………………………. 3

3 Cleaning Process & Sequence………………………………………………………………………………………. 4

4 Standards & Reference Frameworks……………………………………………………………………………… 4

5 Roles & Responsibilities……………………………………………………………………………………………… 5

6 Service Benefits………………………………………………………………………………………………………… 5

7 Next Steps………………………………………………………………………………………………………………. 5

1 Purpose & Service Overview

Raised-floor voids and plenums are the lungs of a data centre — every degree of cooling capacity depends on air reaching the right rack, unobstructed. Over time, abandoned cabling, construction debris, dust and packaging accumulate beneath the floor, restricting airflow, creating hot spots, and triggering thermal alarms that have nothing to do with IT load.

This service specification sets out DCS Australia’s Sub-floor & Plenum Cleaning program — a thorough, forensic-grade clean of raised-floor voids, plenums and cable trays that removes the dust loads and obstructions eroding cooling performance, restoring the airflow the facility was designed for.

Service Objectives

Restore designed airflow — paths beneath the raised floor.
Remove dust and particulate loads — that drive thermal alarms and cooling inefficiency.
Clear obstructions — abandoned cabling, debris and packaging from voids and cable trays.
Reduce hot spots — and uneven cooling across the data floor.
Provide auditable evidence — of before-and-after conditions for governance and compliance.

2 Scope of Services

The service covers the following core work streams, described in detail below:

Sub-floor void cleaning beneath the raised floor
Supply and return air plenum cleaning
Cable tray and containment cleaning
Obstruction and debris removal
Detailed condition reporting

2.1 Sub-Floor Void Cleaning

HEPA-filtered cleaning of the full sub-floor cavity, including structural supports, the underside of floor tiles, and areas beneath server racks and PDUs where contamination concentrates.

2.2 Plenum Cleaning

Removal of dust, fibre and debris from supply and return air plenums, restoring intended pressure differentials and preventing bypass air loss around tile edges and penetrations.

2.3 Cable Tray Cleaning

Cleaning of cable trays and containment to remove accumulated dust without disturbing live cabling, carried out using anti-static, residue-free methods safe for a live floor.

2.4 Obstruction & Debris Removal

Identification and removal of abandoned cabling, construction offcuts, packaging and other debris that restrict airflow or block access for future maintenance.

2.5 Detailed Condition Reporting

Every engagement includes before-and-after photographic evidence and a written condition report, flagging any structural, airflow or contamination issues found for further investigation.

3 Cleaning Process & Sequence

Work is carried out on a live, energised floor using safe tile-lift sequencing and containment-aware methods, so cooling and power are never interrupted. The table below outlines the standard sequence of works.

Stage	Activity	Frequency	Purpose
1. Pre-clean survey	Tile-by-tile inspection and photographic baseline of voids and plenums	Per engagement	Identify contamination hotspots and airflow risks before work begins
2. Isolation & safety setup	VESDA/fire isolation, sticky mats, tile lifters, PPE, safe tile-lift sequencing	Per engagement	Protect live equipment and personnel while the floor is open
3. Debris & obstruction removal	Clearing abandoned cabling, packaging and loose debris from voids and trays	Per engagement	Restore designed airflow paths and reduce cooling short-circuits
4. HEPA-filtered cleaning	Cleaning of sub-floor surfaces, cable trays, pipework and tile undersides	Per engagement	Remove dust loads to ISO 14644 cleanliness levels
5. Plenum & tile reinstatement	Cleaning and reseating of floor tiles, edge seals and grommets	Per engagement	Re-establish under-floor pressure and prevent bypass air loss
6. Final inspection & reporting	Post-clean photographic evidence and condition report	Per engagement	Provide auditable proof of work and flag items for follow-up

4 Standards & Reference Frameworks

The service is designed to align with recognised industry frameworks, including:

ISO 14644-1 — Cleanroom and associated controlled environment classification
ASHRAE TC 9.9 — Data centre thermal guidelines and particulate contamination guidance
Uptime Institute Tier Standard — Operational Sustainability maintenance expectations
Manufacturer maintenance schedules for CRAC/CRAH and raised-floor systems

Where local regulatory, insurance, or client contractual requirements impose additional standards, these should be layered on top of the baseline scope above rather than replacing it.

5 Roles & Responsibilities

Role	Responsibility
Facility Operations Manager	Approves the cleaning scope, schedule, and access windows for sub-floor works
DCS Cleaning Technicians	Execute tile-lift sequencing, HEPA-filtered cleaning, and debris removal to procedure
Site Reliability / Critical Facilities Lead	Reviews the condition report, tracks flagged items, and confirms airflow restoration

6 Service Benefits

Reduced thermal alarms — clearing dust loads and obstructions restores airflow and removes a common false-alarm trigger.
Lower cooling costs — unobstructed plenums mean cooling systems work less to achieve the same result.
Extended equipment life — consistent, designed airflow reduces thermal stress on IT hardware.
Audit-ready evidence — photographic before-and-after records support compliance and warranty requirements.

7 Next Steps

We recommend an initial sub-floor survey to assess current contamination and airflow conditions, from which a tailored cleaning scope and frequency can be proposed — as a standalone clean or as part of an ongoing preventative maintenance program.

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