Preventative Maintenance Checklist

For Facilities with Low Cooling Risk

Your quiz results suggest that airflow management and cooling performance in your facility appear to be working well. Even so, cooling conditions can change over time as equipment, layouts, and densities evolve.

Use this checklist as part of routine preventative maintenance to keep cooling performance consistent.

Purpose

Cooling issues don’t start as failures. They start as small airflow breakdowns that go unnoticed.
This checklist helps you catch them early—before they turn into hot spots, alarms, or capacity limits.

Instructions

Walk through your aisles and answer Yes or No

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Routine Walkthrough — Are you physically checking the space?

• Do you perform regular walkthroughs of the data hall (at least monthly)?

• Do you check for new gaps, missing panels, or open spaces during each walkthrough?

• Do you look for changes after installs, moves, or adds (IMACs)?

Rack Hygiene — Are racks staying sealed over time?

• Are blanking panels still in place (not removed during installs)?

• Are side panels intact and properly installed?

• Are cable openings sealed after work is completed?

Containment Integrity — Is separation holding up?

• Are containment doors closing fully after use?

• Are ceiling panels properly aligned and sealed?

• Are there no new gaps or openings in containment?

Airflow Consistency — Is cooling behavior stable?

• Do cold aisles feel consistently cool across all rows?

• Are there no new hot spots developing over time?

• Are rack temperatures staying consistent week to week?

Monitoring & Visibility — Are you catching issues early?

• Do you regularly review rack-level temperature data?

• Do you investigate temperature anomalies when they appear?

• Do you know which racks trend warmer over time?

Change Management — Are you validating after changes?

• Are airflow conditions checked after adding new equipment?

• Are layout or containment changes reviewed for airflow impact?

• Do you confirm cooling performance after density increases?

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Interpreting Your Results

• Mostly Yes
  Your environment is being actively maintained. You’re preventing issues before they start.

• 6–8 Yes
  You have a process, but gaps may allow small issues to build over time.

• 5 or fewer Yes
  You’re likely reacting to problems instead of preventing them.

  Expect over time:

  • Gradual hot spot development

  • Loss of usable cooling capacity

  • Increased fan speeds and energy use

  • More frequent troubleshooting

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What to Do Next

• Standardize this process
  Turn this into a monthly or post-change checklist your team follows.

• Focus on small fixes
  Most airflow issues come from simple things—missing panels, gaps, or unsealed openings.

• Validate periodically
  Even well-maintained environments drift over time.

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Need More Help?

Book a preventative airflow review with Purkay Labs.

We’ll:

• Identify early-stage issues before they become problems

• Highlight easy fixes your team can handle immediately

• Show where you’re losing cooling efficiency (and capacity)

This is the fastest way to stay ahead—without overbuilding or overcooling.

Purpose
Things seem stable. This check ensures your cooling is actually performing the way you think it is.

Answer Yes / No

Monitoring Coverage — Can you see what matters?

• Do you have rack-level inlet temperature monitoring?

• Do you have visibility across all rows—not just select areas?

Consistency — Is performance uniform?

• Are temperatures consistent across racks in the same row?

• Do cold aisles remain stable under load?

Containment — Is airflow controlled?

• Is your containment system fully sealed?

• Do doors and panels close properly without gaps?

Cooling Confidence — Do you know your limits?

• Do you understand your cooling capacity at peak load?

• Are you confident you can support additional IT load?

Change Management — Are you validating over time?

• Have recent changes been thermally validated?

• Do you periodically verify performance, not just monitor it?

Interpreting Your Results

• Mostly Yes
  Your environment is likely stable and well managed.

• 6–8 Yes
  You’re stable, but gaps in visibility or airflow control may exist.

• 5 or fewer Yes
  You may be missing hidden issues—move to diagnosis.

What to Do Next

• Stay ahead of problems
  Periodically validate airflow, especially after changes.

• Close visibility gaps
  Improve rack-level monitoring where needed.

• If unsure
  Run a targeted assessment before issues appear.

For Facilities with Low Cooling Risk

Your quiz results suggest that airflow management and cooling performance in your facility appear to be working well. Even so, cooling conditions can change over time as equipment, layouts, and densities evolve.

Use this checklist as part of routine preventative maintenance to keep cooling performance consistent.

1. Verify Rack Airflow Management

Inspect racks periodically to ensure airflow paths remain clear.

Check for:

• missing blanking panels

• open rack spaces

• blocked airflow at rack fronts or rears

• equipment installed outside containment patterns

Why this matters

Small airflow disruptions can gradually reduce cooling efficiency.

2. Monitor Temperature Consistency Across Rows

Occasionally walk the data hall and compare rack inlet temperatures.

Look for:

• noticeable differences between adjacent racks

• unusually cold areas in cold aisles

• racks that feel warmer than the surrounding row

Why this matters

Consistent temperatures usually indicate balanced airflow distribution.

3. Review Cooling Unit Performance

Review cooling unit operating conditions.

Check for:

• stable supply temperatures

• reasonable return air temperatures

• normal operating cycles for cooling units

Why this matters

Cooling units running continuously or at very low Delta-T may indicate hidden airflow issues.

4. Track Rack Density Changes

When new equipment is installed, verify that airflow patterns have not been disrupted.

Watch for:

• newly installed high-density racks

• increased fan speeds in nearby equipment

• changes in rack inlet temperatures

Why this matters

Higher-density equipment can change airflow patterns even in well-balanced environments.

5. Inspect Containment Systems

Inspect containment periodically.

Check for:

• gaps in containment doors or panels

• damaged containment structures

• airflow leakage between hot and cold aisles

Why this matters

Containment effectiveness directly affects cooling efficiency.

6. Include Electrical Spaces in Cooling Checks

Confirm that temperatures remain stable in support spaces such as:

• UPS rooms

• battery rooms

• electrical distribution areas

Why this matters

Heat buildup in these spaces can affect equipment reliability.

7. Periodically Validate Cooling Performance

Even well-performing facilities benefit from occasional airflow validation.

Consider periodic temperature scans or airflow assessments when:

• rack densities increase

• layouts change

• new cooling equipment is installed

Why this matters

Routine validation helps confirm that cooling systems continue operating as expected.

Cooling systems work best when airflow paths remain stable.

Preventative checks help ensure that small changes do not turn into larger cooling issues.

Need a Deeper Look?

Purkay Labs helps operators verify cooling performance in live data centers using portable rack-level measurement tools.

A thermal validation test can help teams:

• identify hidden hot spots

• locate airflow leaks

• uncover stranded cooling capacity

• confirm cooling resiliency

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Want to Learn More on Preventative Maintenance ?

Check out these other Keep your Cool Articles or visit our learning resources page.