UL 325 Safety Standards & Entrapment Protection
UL 325 requirements for residential and commercial openers, entrapment devices, constant-pressure controls, and reversal systems.
- Explain the purpose and scope of UL 325 safety standards for garage door openers
- List the required entrapment protection devices and reversal systems
- Describe constant-pressure-to-close control requirements and when they apply
- Identify commercial monitored input requirements for door operators
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UL 325 Requirements for Residential Openers
What Is UL 325?
UL 325 is the safety standard published by Underwriters Laboratories that covers door, drapery, gate, louver, and window operators and systems. For the garage door industry, UL 325 defines the minimum safety requirements that every residential and commercial garage door opener must meet before it can be sold in the United States.
UL 325 addresses entrapment protection - preventing a closing door from trapping a person, child, or pet. The standard has been revised multiple times, with each revision adding stronger safety requirements.
Residential Requirements Summary
Every residential garage door opener must include:
- Two independent entrapment protection systems - typically photo eyes plus auto-reverse (force-based)
- Auto-reverse on contact - the door must reverse when it contacts a 1.5-inch obstruction (2x4 test)
- External entrapment device - photo eyes, sensing edges, or constant-pressure-to-close
- Monitored safety inputs - the opener must detect disconnected or faulted sensors
- Manual release - emergency disconnect that allows manual door operation
UL 325 is the governing safety standard for garage door openers. Residential openers require two independent entrapment protection systems: force-based auto-reverse and an external device (typically photo eyes). The current standard is the 7th Edition (originally published 2017, with revisions through 2023 codified into 16 CFR Part 1211 by CPSC in 2024).