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UL Solutions Numbering Systems for Penetration Firestop Systems and Joint Systems

Explore UL Solutions numbering systems for penetration firestop and joint systems to support accurate identification and promote leading standards in fire safety.
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Expanding UL Solutions numbering systems

UL Solutions has a long-established numbering system for Through-Penetration Firestop Systems (XHEZ) and Joint Systems (XHBN). These categories have been around for many years and are nearing the end of the available system numbers. Specifically, the C-AJ-2000 series of Through-Penetration Firestop Systems and the HW-D-0000 series of Joint Systems are affected by the limited availably of the current system numbers.

For example, in UL Product iQ® database the most recently published system in the C-AJ-2000 series is C-AJ-2923 and the most recently published system in the HW-D-0000 series is HW-D-0944. Each series has 999 system numbers available to them: C-AJ-2001 through C-AJ-2999 and HW-D-0001 through HW-D-0999. To maintain continuity in numbering schemes, and to allow for further promulgation of Through-Penetration Firestop Systems and Joint Systems by UL Solutions, there is a need to enhance the numbering sequence to accommodate these series running out of available numbers.

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Frequently asked questions

No, existing system numbers will not change.

After HW-D-0999 is issued, the next system number that UL Solutions will issue will have five digits, instead of four. The next system number will still start with 0 (zero), followed by four digits. The 0 (zero) at the beginning of the number series indicates a dynamic head-of-wall system with a nominal joint width of less than or equal to 2 in., and this will remain the same for the new numbering sequence as well. The next system numbers will be HW-D-01001, HW-D-01002, HW-D-01003, etc.

The leading digit in the numbering sequence and its significance for the type of penetrant, size of joint, etc., in each category will not change.

After C-AJ-2999 is issued, the next system number that UL Solutions will issue will have five digits instead of four. The next system number will still start with 2, followed by four digits. The 2 at the beginning of the number series indicates nonmetallic pipe, conduit or tubing, and this will remain the same for the new numbering sequence as well. The next system numbers will be C-AJ-21001, C-AJ-21002, C-AJ-21003, etc.

No, UL Solutions is not changing any existing system numbers because the existing system numbers are referenced in many locations, such as customer websites, literature and other materials.

Going forward, when any series runs out of system numbers, UL Solutions will expand the series numbering from four to five digits for new systems and keep the leading digit the same. This enables searching for a system in Product iQ to remain consistent with current practices, and the type of penetrant, size of joint or other information indicated by this number can still be recognized and identified.

UL Solutions has already completed the technology updates to support both the existing four-digit sequence and the enhanced five-digit sequence so that any searches in Product iQ will continue to work properly.

At this time, the C-AJ-2000 series of Through-Penetration Firestop Systems and the HW-D-0000 series of Joint Systems are the only two series that are nearing their end of available system numbers, so changes will take effect for them soon. Other applicable numbering systems will be altered as needed in the future.

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