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Clean Agent Room Integrity Testing (Door Fan Test)

A clean agent system can be perfectly designed and still fail commissioning if the enclosure leaks. Room integrity testing, commonly called a door fan test, is the proof step that tells you whether the room will hold agent concentration long enough to suppress fire and help prevent re ignition.

This sub page is for owners, facility teams, general contractors, and engineers who need a practical, field focused explanation of what the test measures, why rooms fail, and how to get the enclosure ready the first time. For the broader sealing guide, see Proper Sealing of Clean Agent Rooms.

Need help with a failing enclosure, or commissioning is coming fast: call 1-800-360-0687 or (610) 709-5000, or use our contact form.

If you want the fastest path to answers, share the room dimensions, ceiling height, whether the ceiling plenum and raised floor are part of the protected volume, and the current status of HVAC shut down and dampers.

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At a Glance

  • Goal: confirm the enclosure can hold agent concentration for the required hold time, based on measured leakage.
  • Common triggers: new clean agent or inert gas commissioning, major renovation, frequent cable changes, or a prior failed test.
  • What fails rooms most often: above ceiling leakage, unsealed penetrations, poor door gasketing, plenum pathways, and uncontrolled HVAC openings.
  • What you get: measured leakage metrics, predicted hold time, and a practical list of where to seal, then re test until it passes.
  • Where this fits: part of a full special hazard system scope that also includes detection, releasing logic, and commissioning documentation.
Properly sealed computer room enclosure for clean agent or inert gas fire suppression

A tight enclosure is not optional, it is the foundation of clean agent and inert gas performance.

What the Door Fan Test Is

A door fan test is an enclosure integrity test that measures how much air leaks in and out of a room at specific pressure differences. From that measured leakage, software models how long a gaseous suppression agent is expected to remain effective in the protected volume.

People call this test different names, door fan test, room integrity test, enclosure integrity test, blower door test. The intent is the same, prove the room can support total flooding suppression, not guess.

What the test does, and what it does not do

  • It does: quantify leakage and predict hold time based on measured air flow and pressure.
  • It does: identify whether leakage is primarily high level, low level, or both, which helps focus sealing work.
  • It does not: replace correct agent quantity calculations, nozzle layout design, or proper releasing logic.
  • It does not: guarantee real world performance if the room is later modified, doors are left open, dampers do not close, or new penetrations are added without resealing.

Why Integrity Matters for Clean Agents and Inert Gas

Total flooding systems are engineered around concentration. Clean agents are designed to reach a specific percent by volume, inert gas systems are designed to reduce oxygen to a level that stops combustion while remaining within accepted exposure guidance for the space. If the enclosure leaks, concentration drops, and re ignition risk rises.

Many designs reference a minimum hold time, often around 10 minutes for many clean agent applications, but the actual requirement depends on the agent, the hazard, and the standard or AHJ expectations for your project. The door fan test is how you prove the enclosure supports that requirement.

SSI works across both clean agents and inert gas systems, including SF-1230 / FK-5-1-12, ECARO-25, FM-200, and ProInert2. The enclosure integrity principles are consistent across all of them.

How the Test Works and What You Receive

Step by step, what happens on site

  1. The room is prepared, doors closed, obvious temporary openings addressed, and the protected volume confirmed.
  2. A calibrated fan is installed in a doorway or other suitable opening.
  3. The fan pressurizes and depressurizes the room while measuring air flow at specific pressure points.
  4. Software calculates leakage metrics, including an equivalent leakage area, then estimates agent retention and hold time based on the design assumptions.
  5. If the predicted hold time is short, technicians locate leaks (often using smoke tools), sealing corrections are made, and the test is repeated until it meets the requirement.

What the report should help you do

  • Demonstrate enclosure integrity to the AHJ and project stakeholders, as part of commissioning documentation.
  • Give contractors a targeted punch list of sealing work, instead of random resealing.
  • Support long term maintenance by creating a baseline, so future modifications can be evaluated against what the room originally achieved.
  • Prevent wasted money: adding agent to compensate for a leaky room is a losing move if the enclosure cannot hold concentration.

Most Common Failure Points

Failed tests are rarely mysterious. They come from predictable leakage paths that were not built as a true enclosure, or that were compromised after construction. Use the list below as a fast diagnostic map.

Leakage area Why it fails rooms What to check first
Top of wall, above ceiling If walls stop at a suspended ceiling, gas can leak over the top into adjacent spaces, destroying hold time. Verify slab to deck construction or a sealed barrier above the ceiling that truly closes the enclosure.
Cable trays, conduit, sleeves High volume penetrations add up fast, and frequent changes reopen sealed areas. Seal both sides where applicable, use listed firestop systems where required, and control moves, adds, and changes.
Doors and frames Gaps at jambs and undercut doors are common low level leakage sources. Door sweeps, gasketing, proper latching, automatic closers, and no propping doors open.
HVAC ducts, plenums, shafts Uncontrolled pathways act like open windows. Dampers that do not close can make the test meaningless. Confirm release interlocks, damper operation, and whether plenums are inside the protected volume or isolated.
Windows, glazing, wall joints Perimeter gaps and unsealed joints leak, and pressure change during discharge can stress weak glazing details. Inspect perimeter seals, joint treatments, and confirm glazing details align with project requirements.

For a deeper sealing breakdown with trade coordination notes, use the main guide: Proper Sealing of Clean Agent Rooms.

Pre Test Sealing Checklist (Built for Real Projects)

This is the checklist that prevents expensive commissioning delays. If you cannot check these off, you are gambling with schedule and rework.

Enclosure definition

  • Confirm what is included in the protected volume, the main room, the ceiling void, the raised floor, equipment voids, and any connected spaces.
  • Confirm doors and access panels close and latch properly, including double doors and pass throughs.
  • Confirm dampers and shutdown interfaces that must operate on release are installed and functional.

Penetrations and edges

  • Seal cable and conduit penetrations, including hidden penetrations behind racks, cabinets, and wall mounted equipment.
  • Seal top of wall conditions and above ceiling pathways, especially where walls stop at grid ceiling.
  • Seal perimeter joints at walls, floors, and ceilings, using appropriate fire rated systems where required by code and wall rating.

Doors and openings

  • Install door sweeps and gasketing appropriate for the opening, without compromising life safety egress.
  • Eliminate undercut gaps that function like permanent vents.
  • Confirm any dedicated pressure relief vent strategy is coordinated with the suppression design, do not improvise openings to make the room breathe.

Construction and Retrofit Notes

For general contractors and trades

  • Put sealing in the scopes: electrical, low voltage, and mechanical scopes should explicitly include resealing after cable pulls and penetrations.
  • Sequence matters: perform a visual enclosure walkdown before finishes and before the room is packed with equipment.
  • Do not hide leaks: if you have to remove ceiling tiles or cut access panels to seal, do it early, not after a failed test forces rework.

For owners and facility teams after commissioning

  • Treat every new penetration as a performance risk until it is resealed and documented.
  • If HVAC paths change, dampers are replaced, or major cable infrastructure changes occur, plan for integrity re testing as a best practice.
  • Align integrity control with ongoing inspection and maintenance programs for clean agent systems and inert gas systems.

Codes and Standards

Integrity testing and hold time expectations are driven by standards, project specifications, and AHJ interpretation. Use the references below as the baseline, then confirm what applies to your system and jurisdiction.

For special hazard engineering context that influences enclosure planning, see Design Considerations for Special Hazards. For regulatory context affecting some clean agents, see AIM Act and HFC phasedown.

Service Area

Suppression Systems, Inc. supports room integrity testing, sealing consulting, and clean agent commissioning throughout Pennsylvania, New Jersey, New York, Delaware, and Maryland, with operations based in Breinigsville, PA. We routinely support new construction, fit outs, and retrofits where schedule, compliance, and commissioning documentation matter.

FAQs

When should we schedule the door fan test?

Schedule after enclosure work is complete and before the room is buried behind finishes or packed with equipment. If the project has heavy cable activity, consider a pre test walkdown, then a final test just before commissioning.

What is hold time, and why does it matter?

Hold time is the predicted period the agent remains effective in the protected volume. If hold time is short, concentration can drop quickly and re ignition risk increases, especially if ignition sources remain or hot surfaces persist.

If the room fails, do we just add more agent?

Adding agent can increase cost without solving the root problem if leakage is severe. The correct path is to identify leakage pathways, seal them, then re test until the enclosure supports the required retention.

Does this apply to inert gas systems too?

Yes. Inert gas systems also require an enclosure that supports the design assumptions. Leakage affects retention and predictability, and it can complicate commissioning and stakeholder acceptance. See ProInert2 for inert gas system context.

Next Steps

If you want SSI to support integrity testing or sealing troubleshooting, send:

  • Room dimensions, ceiling height, and whether raised floor and ceiling voids are included in the protected volume.
  • Agent type and system type, clean agent or inert gas, and commissioning timeline.
  • HVAC details, dampers, shutdown sequence expectations, and any known plenum pathways.
  • Any recent construction changes, cable pulls, or prior test results if available.

Call 1-800-360-0687 or (610) 709-5000, or use our contact page.

Related SSI Pages

Suppression Systems Inc.

155 Nestle Way, Suite 104, Breinigsville, PA 18031

Toll Free: 1-800-360-0687, Phone: (610) 709-5000, Fax: (610) 709-5001

Email: info@suppressionsystems.com