
STI Polycarbonate Detector Stopper Surface Mount
Key Features
- Tough clear polycarbonate detector stopper to help protect smoke detectors from vandalism and damage.
- Supplied with a 50 mm spacer with conduit knock-outs for surface mount installations.
- Slots are designed to help protect the detector while allowing the LED to remain visible.
- Suitable for areas where vandalism can cause false alarms and increased maintenance.
- Polycarbonate tested from -40°C to 49°C.
Specifications
- Item Code: STI8130
- Brand: STI
- Product Type: Polycarbonate detector stopper
- Mounting Type: Surface mount (includes 50 mm spacer)
- Finish: Clear
- Suits: Smoke detectors
- Temperature Range: -40°C to 49°C (polycarbonate tested)
What's In The Box
- STI polycarbonate detector stopper cover.
- 50 mm spacer (with conduit knock-outs).
- Fixing kit.
Suitable Uses
- Facilities where smoke detector vandalism can cause false alarms.
- Correctional facilities and mental health environments.
- Public areas such as schools, corridors, lobbies and amenities.
- Commercial and industrial sites requiring added detector protection.
Dimensions

PDF Resources
Frequently Asked Questions
- Does this model include a spacer for surface mounting?
Yes. STI8130 is supplied with a 50 mm spacer to suit surface mount applications. - Is the detector LED still visible once installed?
Yes. The design protects the detector while allowing the LED to remain visible. - Where is this typically used?
It is commonly used in areas where vandalism or accidental damage can lead to false alarms and increased maintenance.
Additional Information
- Clear polycarbonate provides an aesthetic alternative to steel detector stoppers.
- Supplied with a full fixing kit, with optional anti-tamper resistant fixings available where required.
Technical Drawing

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