STI STI-8201-SS 50mm Spacer for Smoke Detector Damage Stopper

Overview

The STI-8201-SS is a 50mm stainless steel spacer engineered to support proper mounting clearance and frame alignment within STI Damage Stopper® protective assemblies for smoke detectors. This accessory solves the installation gap between the detector housing and the polycarbonate protective frame, ensuring the frame sits flush without binding or misalignment that would compromise the tamper-proof seal or obstruct legitimate access. Stainless steel construction resists corrosion in indoor and light-duty outdoor environments — a critical detail if your smoke detectors sit in areas with moisture or salt spray exposure.

Compatibility

The STI-8201-SS spacer is compatible with STI Damage Stopper II and Weather Stopper II protective frame assemblies designed for standard smoke detector housings. Verify your specific detector model against the STI compatibility matrix — the spacer accommodates standard 7mm masonry drill hole configurations and works with the gasket and cable entry insert systems supplied with STI frame kits. If you are installing a Weather Stopper II unit over a larger weather-exposed device (such as manual call points), confirm the spacer depth does not exceed the frame's design envelope.

Installation Notes

Installation follows the STI frame assembly procedure: position the spacer over the detector, align the four mounting holes with the frame holes, drill using a 7mm masonry bit, and secure with the provided wall fixings. The 50mm standoff height ensures the frame clears the detector housing while maintaining the gasket compression necessary for weather sealing. For surface installations, use the cable entry inserts to blank unused holes. No power or wiring is required for the spacer itself — it is a passive mechanical component.