STI STI-13020CG Universal Stopper with Horn Flush Mount

Overview

The STI-13020CG is a flush-mount protective cover designed to shield fire alarm pull stations, intercom stations, emergency buttons, numeric keypads, and electrical switches from vandalism, accidental activation, dust, and harsh environments — indoors and out. Built from heavy-gauge UV-stabilized polycarbonate rated for operation from -40°F to 250°F (-40°C to 121°C), this unit ships with an integrated 105dB horn and mounts flush to the wall, keeping the protected device fully accessible for legitimate use while deterring tampering. STI-13020CG (often searched as STI 13020CG) is one model in STI's broad Universal Stopper line, which covers flush, surface, and weatherproof backbox mounting configurations.

Key Features

• IP54 Environmental Rating: Dust ingress is limited and splash water from any direction is blocked — suitable for corridors, stairwells, covered exterior entries, and light industrial spaces where hose-down or driving rain isn't a daily concern. If your application involves direct water jets or full outdoor exposure without overhead protection, step up to a backbox model with IP56 rating available in the same family.
• 105dB Integrated Horn: The built-in siren triggers on cover lift, providing an immediate local deterrent loud enough to be heard across a standard commercial floor plate. This removes the need for a separate alarm device at the protected station.
• Flush Mount Profile (Under 4 Inches Deep): The low-profile flush design keeps the assembly ADA-compliant — operable reach range and force requirements are met — and avoids protruding hardware in high-traffic corridors where bump and snag are real risks.
• Heavy-Gauge Polycarbonate Construction: The cover is molded from impact-resistant, UV-stabilized polycarbonate. UV stabilization prevents yellowing and embrittlement over time, maintaining cover transparency so the protected device remains visible without opening the cover.
• 12–24VDC Relay Output Option: An optional relay output with 12–24VDC supply allows integration with building management or access control systems — useful when you need a tamper event to trigger a BMS alert or log an entry at the head-end without relying solely on the local horn.
• UL/cUL Listed (No. S2466): Third-party listing means the assembly has been independently evaluated, simplifying AHJ approval on fire alarm and life safety projects where unlisted protective covers can create inspection friction.
• 3-Year Polycarbonate Warranty: The cover body carries a 3-year warranty against breakage under normal use; electromechanical and electronic components carry a 1-year warranty — useful to know when specifying for high-traffic installations where cover abuse is likely.
• Available in Multiple Colors with Custom Labels: Red, green, blue, yellow, white, and black housings with free custom labeling allow the cover to match existing signage schemes or meet site-specific color-coding requirements without a separate label order.

Integration and Compatibility

The STI-13020CG is sized to fit the majority of dual fire alarm pull stations and is compatible with intercom stations, emergency buttons, and standard electrical devices. The flush mount option suits single-gang and compatible multi-gang device placements. Optional accessories are available within the STI Universal Stopper line to extend compatibility. The relay output (12–24VDC) pairs with most commercial access control and BMS panels. Review the fire alarm accessories category for compatible backboxes and mounting plates if your rough-in requires a surface or weatherproof configuration instead of flush mount.

Frequently Asked Questions

Q: What is the IP rating of the STI-13020CG?

A: The STI-13020CG carries an IP54 rating, meaning it resists dust ingress and splash water from any direction. For full outdoor or washdown environments, consider a backbox-mount variant in the STI Universal Stopper line rated to IP56.

Q: Does the STI-13020CG include a horn/siren?

A: Yes. The STI-13020CG includes an integrated 105dB horn that activates when the cover is lifted, providing immediate local deterrence without a separate alarm device.

Q: Is the STI-13020CG ADA compliant?

A: Yes. The flush-mount design keeps the unit under 4 inches in depth and meets ADA operational requirements for reach range and activation force.

Q: What is the operating voltage for the STI-13020CG?

A: The unit operates at 24VDC, with the optional relay output supporting 12–24VDC supply.

Q: What certifications does the STI-13020CG carry?

A: The STI-13020CG is UL/cUL listed under file number S2466, and IP54 rated. It is ADA compliant for operation.

Q: What is the warranty on the STI-13020CG?

A: The polycarbonate cover carries a 3-year warranty against breakage during normal use. Electromechanical and electronic components carry a 1-year warranty.

Karl Wilson

The STI-13020CG is one of those devices that looks simple but saves significant rework on life safety inspections. The UL/cUL S2466 listing is the spec I flag first when specifying protective covers on fire alarm projects — an unlisted cover can stall AHJ sign-off and force a costly swap late in a project. The flush-mount configuration with the integrated 105dB horn covers the two most common requirements (low-profile install and local deterrence) in a single SKU.

Technical Highlights:

• IP54 Rating: Handles splash and dust reliably for covered entry points and interior corridors — not a washdown rating, so plan accordingly for exposed exterior walls.
• 105dB Integrated Horn: Loud enough to be heard across a standard commercial floor without additional sounder devices, reducing SKU count and wiring runs at each protected station.
• 12–24VDC Relay Output (Optional): Enables tamper events to feed directly into BMS or access control head-ends — useful in healthcare and education facilities where tamper logging is an audit requirement.

Deployment Considerations:

• The flush-mount option requires a compatible device rough-in depth — verify your pull station or intercom station depth against the STI-13020CG cover profile before ordering to avoid a backbox upsell on site.
• The 3-year cover warranty applies to normal use; high-traffic environments where repeated cover lifts are expected (school corridors, transit hubs) should be evaluated against the 1-year electromechanical component warranty cycle.

For K-12 and higher education facilities where intercom stations and emergency buttons are frequent vandalism targets, the STI-13020CG flush-mount configuration with horn is a direct-fit solution that satisfies ADA compliance, AHJ listing requirements, and local deterrence in a single installed unit.