Amerex OEM MRM Bracket - 28226
The Amerex 28226 OEM MRM Bracket is the factory-designed wall mounting bracket for the Amerex Mechanical Release Module (MRM) and MRM II fire suppression system control heads. While the MRM enclosure (13393) houses the release module itself, the 28226 bracket provides the structural anchor that secures the entire enclosure assembly to the wall substrate — transferring the weight and operational forces of the MRM to the building structure.
Correct mounting of the MRM enclosure is a NFPA 17A and NFPA 96 installation requirement. The 28226 is engineered to maintain precise alignment of the enclosure, ensuring the detection cable enters the module at the correct angle without creating friction points in the cable run. A misaligned or undersized mounting bracket is one of the most common causes of ghost trips and short-stroke failures in Amerex KP systems because it allows the enclosure to shift under the constant spring tension of the detection line.
For fire protection contractors completing new Amerex KP or IS system installations, the 28226 bracket is an essential fire suppression system part that must be specified alongside the 13393 enclosure and 11977 MRM II actuator. Using OEM mounting hardware ensures the enclosure remains in its factory-calibrated position throughout the service life of the system.
| Feature | Details |
|---|---|
| Manufacturer | Amerex Corporation |
| Part Number | 28226 |
| Application | MRM and MRM II enclosure wall mounting |
| Compatible Enclosure | Amerex 13393 stainless steel MRM enclosure |
| Function | Structural wall anchor for MRM control head assembly |
| Certifications | UL Listed, OEM Original |
Wall Substrate Requirements
The 28226 bracket must be anchored into structural substrate — wood studs, masonry, or metal framing rated for the combined weight of the enclosure, MRM module, nitrogen cartridge, and the lateral force of the spring-loaded detection line. Never anchor the bracket into drywall alone. Consult the Amerex KP system manual for the minimum fastener specification for your installation substrate.
Alignment Verification
After mounting the 28226, verify the enclosure hangs level and that the detection cable entry points align with the cable run without acute angles. Even a slight tilt in the enclosure position can create friction at the conduit entry that affects detection line tension calibration. Use a level during installation and re-verify alignment after all fasteners are fully torqued.
Annual Inspection
During NFPA 17A semi-annual inspections, check the 28226 bracket fasteners for loosening from vibration — particularly in commercial kitchen environments where hood exhaust fans create significant structural vibration. A loose MRM bracket is a red-tag deficiency that must be corrected before the system inspection is signed off.
Can I use a standard electrical box bracket instead of the 28226?
No. The 28226 is specifically designed for the dimensional footprint and load requirements of the Amerex 13393 MRM enclosure. Using non-OEM mounting hardware can result in enclosure misalignment, inadequate load support, and potential UL 300 compliance failure. Always use the OEM 28226 bracket for Amerex MRM installations.
Is the 28226 included with the 13393 enclosure?
The 28226 bracket is a separate line item from the 13393 enclosure. Verify your complete fire suppression system parts order includes both the enclosure and the mounting bracket to avoid installation delays at the job site.
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