What information is available to support an AHJ review of Automist?
Plumis provides a comprehensive set of UL certification, independent engineering analysis, fire-test evidence, design documentation and technical information to support an AHJ reviewing Automist.
If Automist is being considered as an alternative to an NFPA 13D residential sprinkler system, we recommend starting with three documents:
- Plumis Automist AHJ Submission Package
- Jensen Hughes Automist Equivalency Report
- UL NFPA 13D Equivalence Letter
Together, these explain what Automist is, the code and standards framework under which it is designed, and the independent evidence available to support the AHJ’s evaluation.
Is there a single document an AHJ should start with?
Yes. The Plumis Automist AHJ Submission Package is designed as the starting point for plan review.
It provides an overview of Automist, applicable codes and standards, UL certification, the relationship between NFPA 750 and NFPA 13D, supporting technical evidence and the principal information an AHJ may need during review.
Is there an independent comparison with NFPA 13D?
Yes. Jensen Hughes independently compared Automist, NFPA 750 residential water mist systems and NFPA 13D residential sprinkler systems.
The report examines the purpose of the standards, system components, water supply, pumps, piping and fittings, hydraulic calculations, acceptance, inspection and maintenance requirements, and the respective UL fire-test requirements.
The analysis found that NFPA 13D and NFPA 750 share the same residential life-safety intent and evaluated how Automist addresses the applicable requirements.
Has UL addressed the comparison with NFPA 13D?
Yes. In February 2026, UL Solutions issued a letter specifically addressing Automist and its consideration as an alternative to an NFPA 13D residential sprinkler system.
UL noted that the two technologies have different attributes and design requirements, but confirmed that the residential provisions of NFPA 13D and NFPA 750 have the same overall life-safety purpose.
UL states that an AHJ evaluating a targeted water mist system as an alternative to NFPA 13D can consider their purposes for meeting the life-safety requirements of the standards as equivalent.
Download: UL NFPA 13D Equivalence Letter
What fire-test information is available?
Two principal documents are available.
UL 2167A Fire Test Letter Report
UL Solutions’ underlying fire-test documentation records the residential fire-testing programme conducted on the Automist targeted water mist system.
The testing included different residential fuel packages, fire positions, nozzle locations, obstructions and room configurations.
Full report available on request
Jensen Hughes 18 ft Fire Test Judgement Report
Jensen Hughes independently assessed Automist fire testing conducted with an 18 ft ceiling against the UL 2167A testing conducted with ceilings up to 8 ft.
The report considers the effect of ceiling height on smoke detection, system activation and measured temperatures.
Download: Jensen Hughes Fire Test Judgement Report Rev. 0
What UL certification documents are available?
UL 2167A Certificate of Compliance
The UL Certificate of Compliance confirms certification of the Automist AP09 and AP12 as Water Mist Residential System Units – Targeted Discharge under UL 2167A.
Download: UL 2167A Certificate of Compliance, UL-US-2440774-0
UL Confirmation Letter EX29276
UL Solutions also provides confirmation that Plumis Ltd is associated with UL File EX29276, under the product category Water Mist Residential System Units – Targeted Discharge, in UL Product iQ.
Download: UL Confirmation Letter EX29276
What design and installation information is available?
Automist DIOM Manual
The Design, Installation, Operation and Maintenance Manual is the manufacturer’s principal technical document for Automist.
It defines the system’s design limits and requirements for spray-head positioning, smoke detection, water supply, electrical power, high-pressure distribution, commissioning, acceptance, inspection, testing and maintenance.
Download: Automist DIOM Manual, 50–60 Hz, V2.0
Automist Water Supply Connection Schematic
This drawing shows how Automist connects to the domestic cold-water supply, including isolation, backflow protection, pressure control, pump connections and the high-pressure distribution system.
It also identifies the required pump inlet conditions and considerations where more than one Automist system may operate concurrently.
Download: Automist Water Supply Connection Schematic
DIOM Pump Calculations
These supporting hydraulic calculations document pipe friction losses and the pressure and flow basis of the pre-engineered Automist system.
Download: DIOM Pump Calculations
Additional Layout Pages
Supplemental drawings provide electrical notes, controller connections, smoke-sensor arrangements, equipment details and typical system installation information.
Download: Additional Layout Pages — Electrical Notes & Equipment Details
Are individual product datasheets available?
Yes. Component-level information is available for the principal Automist equipment.
AP12 Pump
Technical specifications for the 240 V / 60 Hz AP12 high-pressure pump, including flow rate, output pressure, inlet pressure, electrical demand and operating conditions.
Download: Product Datasheet AP12 Rev. 02
SH12 Spray Head
Technical specifications for the wall-mounted SH12 targeted water mist spray head, including operating pressure, flow rate, spray characteristics and mounting requirements.
Download: Product Datasheet SH12 Rev. 01
DT03 Smoke Sensor
Technical specifications for the Automist smoke-detection component used to initiate system scanning.
Download: Product Datasheet DT03 Rev. 01
High-Pressure Hose
Specification for the hose used between the Automist pump and spray heads, including construction, working pressure, burst pressure, temperature range and minimum bend radius.
Download: Product Specification — High Pressure Hose
Smoke Sensor Cable
Technical and electrical specification for the two-core cable used for Automist smoke-sensor connections.
Download: Product Specification — Smoke Sensor Cable 2 Core 39200202H-E00
Do I need to submit every document?
Not necessarily. The documents required will depend on the project and the questions raised by the reviewing jurisdiction.
For an initial review, we normally recommend starting with:
- AHJ Submission Package
- Jensen Hughes Equivalency Report
- UL NFPA 13D Equivalence Letter
- UL 2167A Certificate
- Automist DIOM
The remaining technical documents allow the reviewer to examine particular aspects of the system in more detail where required.
Can Plumis help with an active AHJ review?
Yes. If you are an AHJ, fire protection engineer, architect or contractor reviewing Automist, send us the project address, jurisdiction and any questions raised during plan review.
We can identify the relevant documentation and provide technical information to support the review.
Disclaimer: This information is not intended to be a comprehensive guide to all of the aspects of the building/fire code but rather a useful source of background information. Whilst every care has been taken to ensure that the contents of this post are correct at the time of publication, it should never be used as any form of substitution for the full NFPA® codes, standards, recommended practices, and guides. It should be noted that there may be specific additional requirements dependent upon the Authority Having Jurisidiction (AHJ).
Yes. Automist can be used as an alternative to an NFPA 13D fire sprinkler system in one- and two-family dwellings, where permitted by the local Authority Having Jurisdiction (AHJ). Automist is a UL 2167A Listed water mist fire suppression system, designed and installed in accordance with NFPA 750 and the manufacturer’s Design, Installation, Operation and Maintenance Manual (DIOM).
Learn moreAutomist monitors key system functions, automatically exercises each spray head every seven days, and includes dedicated test modes for its smoke sensors. Annual servicing, testing and any recommissioning after an activation are carried out in accordance with the manufacturer’s DIOM.
Learn moreYes, Automist can provide whole-house fire protection in compliance with NFPA 750, which governs water mist fire suppression systems for one- and two-family dwellings. It is designed to be a room-based solution, meaning multiple spray heads can be strategically installed throughout the home to ensure full coverage.
Learn moreTo ensure your Automist system is installed correctly and complies with all necessary standards, it must be fitted by a trained installer. In the US, we recommend choosing from our network of trained installers who are familiar with the system’s unique design and requirements. You can find our official list of approved installers here.
This ensures you receive a professional installation and the peace of mind that your Automist system will perform as intended.
Learn more