Most office buildings have a server room, comms room or IT cupboard that gets cleaned as part of the general office cleaning contract. The cleaner goes in on Thursday evening, vacuums the floor, wipes down accessible surfaces and leaves. It looks clean. The problem is that the standard vacuum cleaner being used may be doing more harm than good.
What standard vacuums do in a server room
A standard vacuum cleaner pulls air in through the filter and exhausts it back into the room. The filter catches visible dust. The fine particles — smaller than half a micron, invisible to the naked eye — pass straight through a standard filter and come out of the exhaust. In a normal room this does not matter. In a server room, those fine particles are blown directly at server inlets, into rack spaces and onto circuit boards.
The result is that the floor looks clean, the visible dust is gone, and the particles that actually damage servers are now circulating in the air and settling inside the equipment. Over time this causes overheating — dust accumulates on heat sinks, blocks airflow, and processors run too hot. It also causes electrical faults — fine conductive particles on circuit boards create tiny current paths between components that cause intermittent failures that are almost impossible to diagnose.
What to ask your cleaning contractor
The question is simple: what vacuum cleaner do you use in the server room, and does it have HEPA filtration?
HEPA filtration captures 99.9% of particles at 0.3 microns — the size that matters for electronic equipment protection. If your contractor cannot confirm HEPA filtration, or does not know what HEPA means, the server room should be excluded from their scope until they can supply the right equipment.
A HEPA filter alone is not enough — the whole machine needs to be sealed. A machine with a HEPA filter but a poorly fitting hose or collection vessel leaks around the filter and bypasses it. Ask for a machine with sealed HEPA filtration throughout.
Signs your server room may have a cleaning problem
- Servers running warmer than usual — check temperature logs if your management software records them
- Fans running louder or at higher speed than they used to
- Intermittent faults that clear themselves — these are often early signs of contamination-related electrical issues
- Visible dust on intake grilles even shortly after a clean — this suggests dust is being redistributed rather than removed
- Your cleaning contractor cannot tell you what vacuum they use or confirm HEPA filtration
What to do
Exclude the server room from the general cleaning scope and brief your contractor separately. Specify HEPA-filtered vacuum equipment only. If your contractor cannot supply it, the room should not be vacuumed until they can. A server room that is not vacuumed accumulates dust gradually. A server room that is vacuumed with the wrong equipment gets contaminated quickly and repeatedly.
If you have recently installed on-premises AI hardware — GPU servers, high-density compute — the specification requirement is higher. These systems reference ISO 14644-1 Class 8 in their hardware requirements and require H14 HEPA filtration and ESD-safe cleaning equipment. This is worth a conversation with whoever manages your facilities contract.
Why your server room needs a HEPA vacuum →
Data centre and server room cleaning equipment →
Questions? Call our Lincoln team on 01522 787978.
