Cleanroom Panel Fire Rating Standards: Your Guide to Safety & Compliance

That distinction is so important that your cleanroom will pass inspection based on that factor alone. This guide will cover all you need to know about the cleanroom panel fire rating standards in practical projects.

Cleanroom fire-rated panels are only effective when the joints, penetrations, and supports conform to those of the tested specimen, as cleanroom panel fire test standards require. Deiiang™ catalogue data will be provided wherever necessary along with site notes from product designer Jason.peng.

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What a Cleanroom Panel Fire Rating Means

A cleanroom panel fire rating is the duration for which a wall or ceiling assembly serves as fire resistant against a prescribed fire exposure medium. Reaction-to-fire classification is used when evaluating the fire hazard rate of a material. These tests define cleanroom wall panel fire resistance in two forms and have different requirements [2].

Fire ratings are represented in minutes, e.g. 30, 60, etc., down to 120 minutes. On the other hand, reaction-to-fire classifications specify classes A1 to F [2].

Table 1: Measurements of flame performance and their proof limits

Fire resistance belongs to the complete assembly

Fire resistance of the assembly is a function of the assembly as a whole and is not specific to the panel. The results of the test are not related to only one of the elements found in the tested specimen, which is why cleanroom panel fire test standards evaluate complete assemblies.

The assembly tested includes all elements: core, facings, joint profiles, fasteners, and the supporting structure. Change only one of those and it renders the tested cleanroom wall panel fire resistance invalid.

Deiiang MGO rock wool panels use an effective width of 1150 mm with thickness ranging from 50 to 100 mm. According to the catalogue, the cleanroom fire-rated panels provide 120-minute protection for this configuration (Internal Deiiang technical data, project-specific verification required). The catalogue also lists hollow MGO cleanroom fire-rated panels at 60-minute protection.

Ratings, classifications, and test results are not interchangeable

Ratings and classifications should not be confused. One indicates how long a wall prevents the flame from spreading, while the other indicates how a material reacts to flame. Interchanging the terms causes an immediate area of non-compliance.

Test documents specify the test specimen, method of installation, and how it will be accepted. A panel that received an A1 classification according to EN 13501-1 has not met the ASTM E119 requirements for 60-minute walls. The most common specification error in cleanroom construction is comparing two different cleanroom panel fire test standards.

Codes, Authorities, and Project Requirements

Cleanroom building code compliance begins with the adopted code for that location. The International Building Code and NFPA 101 have requirements that differ based on the occupancy and hazards involved, so cleanroom building code compliance starts with the use of the room. The authority having jurisdiction interprets those requirements for the project.

Semiconductor work areas are governed by NFPA 318. NFPA 318 requires one hour of rated fire separation between semiconductor manufacturing work areas and adjacent occupancies. ISO class 5 cleanrooms must have non-combustible walls, floors and ceilings as well as partitions.

Table 2: Codes and Evidence Pathways Based on Authority

Establish the applicable code and required performance

The occupancy and use result in required performance for the fire. A pharmaceutical production room and a semiconductor manufacturing plant will follow different codes even when both use similar fire-rated sandwich panels, because fire safety for cleanrooms follows the process housed inside.

It is necessary to check if the area requires fabrication, is hazardous for production of materials, or is general industrial. The edition of code which is accepted establishes the minimum value of separation for cleanroom building code compliance. Confirm interpretation of the authority prior to the design freeze.

Build a defensible compliance submittal

A compliance submission must be the connection between the assembly tested and the specified product. It is impossible to use the catalogue page indicating A1 classification as proof of any fire-resistance rating.

The Deiiang catalogue mentions 120-minute protection for MGO rock wool and 60-minute for hollow MGO, the reference point for cleanroom panel material selection (Internal Deiiang technical data, project-specific verification required). Submit that material alongside the corresponding test report and the detailed description of the assembly.

Table 3: Submittal compliance checklist by project phase

Fire Test Standards and Evidence

Fire test protocols are in place for the construction of test specimens, the exposure of them to fire, and their evaluation through testing. ASTM E119 and UL 263 are the governing fire-resistive testing procedures in North America. EN 13501-1 governs reaction to fire classification in other markets.

Fire tests are not filter tests and the two terms are never to be confused. iso 14644-1 describes air cleanliness in terms of particulate matter concentration. EN 1822 and ISO 29463 qualify HEPA filter and ULPA filters based on the effectiveness of filtration.

Select fire tests that match the required claim

A test method must be accepted as appropriate correspondence for the claim that will be established. If the requirement is for 60 minutes of fire resistance, applicable fire resistance results must be submitted on the entire assembly. Classification of fire reaction has no positive support for that assertion.

Assume a real-life instance of the specification problem. A designer applies EN 13501-1 Class A1 mineral core rather than the actual ASTM E119 constructed assembly in a 60-minute required location, a classic cleanroom panel fire rating mismatch. This use leads to a 0-minute rating for fire resistance, and the authority will reject the submittal.

Keep cleanroom and filtration standards in their proper scope

Fire standards and cleanroom and filtration standards have their own applications and they do not ｒｅｐｌａｃｅ eACH other. ISO 14644-1 and iso 14644-3 determine the classification of cleanliness and methods of testing. They do not include fire-resistance provisions.

An EN 1822 H14 filter has 99.995 percent efficiency on the most penetrating particle size. Such an efficiency statement is not applicable to a wall panel. IEST-RP-CC001, MIL-STD-282, ASHRAE 52.2, and EN 779 are documents on filters and should not be claimed as the fire rating for panels.

Panel Types, Cores, and Fire Performance

Cleanroom panel material selection is based on fire proofs, cleanliness and structural requirements. Core materials determine fire resistance largely, although interfaces provide the rating as well.

The data in Deiiang catalogues includes MGO rock wool, hollow MGO, aluminum honeycomb, paper honeycomb, PU and silica cores (Internal Deiiang technical data, project-specific verification required). Fire-protection values for fire-rated sandwich panels can vary from 60 minutes to 120 minutes depending on core and construction type, which shapes cleanroom panel material selection.

Table 4: Panel core and construction choices

Compare panel core and facing constructions

Core and facing materials work together; using them without each other eliminates assembly fire test performance. Coatings and adhesives add to the performance, so the tested assembly defines the allowed combinations.

Deiiang hollow panels use two upper and lower panels measuring 5 mm each with 11 staggered ribs and 13 connections (Internal Deiiang technical data, project-specific verification required). Fire-protection values for hollow cleanroom fire-rated panels are 60 minutes, while MGO rock wool reaches 120 minutes.

Specify cleanroom fire-rated panels for actual service conditions

Evidence of fire is just one piece of the puzzle. In addition, cleanroom fire-rated panels must resist cleaning agents, maintain surface integrity, and accommodate the cleanroom's pressure regime. A panel may meet fire requirements but create non-conformance issues based on degradation from daily cleaning.

A pharmaceutical area cleaned daily with alcohol-based cleaners requires cleanability of panels and coatings. Semiconductor manufacturing requires chemical resistance and minimal outgassing. Specify fire safety information and servicing conditions in one document.

Wall and Ceiling Assemblies

The cleanroom wall panel fire resistance depends upon continuity across the entire assembly. All joints, doors, windows, and service penetration points must be accounted for in meeting the fire-rated wall continuity requirement. An unsealed conduit penetration point makes the wall non-compliant.

The logic behind the cleanroom ceiling fire rating is that the ceiling assembly includes not only the ceiling panels but also the entire ceiling support system and the plenum interface. If the ceiling acts as a fire separation, everything in the support system and all penetration points must match what has been tested.

Verify wall panel continuity and penetrations

Wall panel continuity is provided by using joint systems and at all penetration points through the wall. Deiiang tongue-and-groove panels interlock at 50 mm thickness, fastened with pull rivets at 300 mm spacing. That spacing is applicable for installation, not for fire testing.

An approved firestop detail must be used in every instance where a conduit, duct or pipe passes through a rated wall. The firestop system must be listed against the penetrant as well as the wall assembly construction. Without a firestop installed, the assembly rating is invalid at that location.

The type of firestop chosen is determined by the chemicals in the environment. Intumescent firestop sealants expand when exposed to heat and suit clean areas without chemicals. Silicone sealants provide chemical resistance in conjunction with low expansion under fire heat.

Table 5: Comparison of firestop materials for cleanroom environments

Confirm ceiling assembly scope and installation

The fire rating of any cleanroom ceiling is based on the suspension system used in the installation. Deiiang ceiling specifications use round steel pipe suspension rods every 1200 mm with turnbuckle baskets for leveling (Internal Deiiang technical data, project-specific verification required). A rated assembly may require tighter spacing.

The plenum space above the ceiling contains pipes, cables and ductwork that must be considered in the cleanroom ceiling fire rating prior to installation. If services are supported by a ceiling that is part of a tested rated assembly, they need to be specified under the rated details. Lights and access panels within a rated assembly require rated details.

Cleanroom Fire Safety and Facility Integration

Fire safety for cleanrooms has to be carried out by coordination of fire protection, HVAC, and room operations. A rated wall or ceiling only serves as one component of fire safety for cleanrooms. Damper devices, smoke detection systems, suppression apparatus, and emergency exits all interact with the cleanroom barrier.

Deiiang catalogue shows dimensions of standard spaces ranging from 2 m × 3 m × 3 m to 10 m × 8 m × 3 m (Internal Deiiang technical data, project-specific verification required). Panel quantities range from 6 m² to 80 m². This helps with layout planning but should not be used for a fire-rated system.

Coordinate fire protection with HVAC and room operation

HVAC systems penetrate rated assemblies on many occasions. A damper or an approved firestop detail is required through every duct crossing a rated wall, a coordination point that supports fire safety for cleanrooms. The damper needs to stay easily accessible for routine inspections without penetrating the cleanroom perimeter.

Control of smoke and cleanroom pressure control are contradictory in some instances, especially if the shutdown of dampers also impacts pressure differences. The established operational strategy indicates which operations proceed automatically and which need manual validation.

Integrate detection, egress, and maintenance planning

Detection, egress, and maintenance should be accomplished in a single planning effort from the design stage. Alarm signals should be both audible and visible in the cleanroom and support areas. Egress paths should remain free of equipment and stored materials.

Shutdown responsibilities depend on the individual's role, not their name. Accessibility for maintenance to any dampers, detectors, and firestop systems should always be available. Records of inspection indicate the assembly, location, and date for each inspection.

Procurement, Installation, and Verification

Procurement choices ultimately determine if the cleanroom installed matches the assembly tested. Supplier documentation review, installation observation, and traceability logs create one compliance chain. Any omission in any part invalidates the fire rating.

In a documented GMP pharmaceutical facility project, Deiiang indicated use of MGO rock wool panels while maintaining iso 8 cleanliness. Project-reported results included a wall assembly that met 120-minute fire rating and validated differential pressure (project-reported; verify against the project file).

Evaluate supplier evidence before purchase

Supplier documentation must link the product to the assembly tested. Certification of compliance does not equal a test report. Request the complete report, which includes the specimen description, method of mounting, and criteria for acceptance.

Ensure the product identifiers, thicknesses, and joint profiles match with those discussed within the report before implementing systems. A report written on 100 mm panels cannot assert the system for 50 mm specifications. Validate against the report scope prior to approval for purchase.

Inspect installation and preserve traceability

Examination of installation verifies that the as-built assembly is consistent with the approved design details. Joints, fasteners, and penetrations are the primary areas of concern in assembly verification.

Jason.peng, Deiiang product designer, identifies corner joints as the area where most installation failures occur, mainly causing gaps at these joints. Users should operate a 0.5 mm feeler gauge along each coved corner joint before approving the installation.

Common Compliance Errors and Corrective Actions

The greatest number of errors in meeting compliance regulations for cleanrooms occurs due to misleading ratings and incomplete documentation. If a panel is called fire-rated, it usually means the panel has a reaction-to-fire rating. The report for testing is often for a different thickness or joint system than that installed.

To rectify the situation, we must first review the evidence. Deny labels that are not supported. Validate the report's scope against what has been installed. Resolve document conflicts prior to the inspection by the authority, not afterward.

Avoid rating and documentation mismatches

Rating and documentation errors can be corrected if identified beforehand. For example, if a wall was installed with 50 mm panels against a test report on 100 mm panels, that information would be inconsistent with the authority's requirements. Corrective action requires a new test or a specification change.

Corrective action will either require changing the assembly to reflect that of the report or obtaining a report that reflects the actual product used. Installation of thicker panels will not automatically increase the rating of an assembly. The assembly that was tested dictates the rating it receives.

Manage changes, repairs, and future audits

Changes and repairs affect fire performance. Replacement of damaged panels with panels of different thicknesses and core materials constitutes changes in assemblies. Repair materials must be used in accordance with the tested configuration, or evidence supporting their use must be obtained.

Evidence that is audit-ready would include the original test report, approved installation detail, as-built record, and documentation pertaining to changes. A structured change management cycle preserves the records throughout the life of the building.

Frequently Asked Questions

What fire rating does a cleanroom panel need?

The cleanroom panel fire rating needed comes from the requirements set forth in the relevant building code and applicable local ordinances. The cleanroom panel must meet the fire-resistive rating established by testing methods recognized for the particular type of installation. A particular cleanroom panel product by itself has no fire-resistive rating.

Are cleanroom fire-rated panels automatically fire-resistance rated?

No. A cleanroom fire-rated panel may be given a classification for reaction to fire without a fire-resistance rating. To claim a fire-resistance rating for the cleanroom project, the manufacturer must demonstrate it via a complete certified assembly report and listing.

Do panel fire test standards apply to the whole cleanroom?

No. The panel fire test standards apply only to the tested specimen, including panels, joints, supports and penetrations. The entire cleanroom installation must still be coordinated for firestop details and all interface points.

Can a panel core's fire classification prove wall fire resistance?

No. The core classification represents material evidence opposing assembly evidence. The actual cleanroom wall panel fire resistance is determined by the combination of facings, joints, supports and methods of installation.

Does the ceiling need the same fire rating as the walls?

Not necessarily. The applicable building codes will indicate whether fire-resistive ratings are required. It is essential to check the ceiling conditions and any applicable plenum with respect to the building codes and the cleanroom project.

What documents should I request from a cleanroom panel supplier?

Ask the manufacturer for the cleanroom panel test report and assembly listings, including the thicknesses tested and the joint system. Traceability documents must ensure that the delivered cleanroom panel matches the tested assembly.

References

• [1] ASTM E119, Standard Test Methods for Fire Tests of Building Construction and Materials.
• [2] EN 13501-1, Fire classification of construction products and building elements.
• [3] NFPA 101, Life Safety Code.
• [4] NFPA 318, Standard for the Protection of Semiconductor Fabrication Facilities.
• [5] UL 263, Fire Tests of Building Construction and Materials.
• [6] iso 14644-1, Classification of air cleanliness by particle concentration.
• [7] ISO 29463, High-efficiency filters and filter media for removing particles in air.
• [8] EN 1822, High efficiency air filters (EPA, HEPA and ULPA).