STI STI-3150NR Weather Stopper Protective Cover
Overview
The STI-3150NR is a polycarbonate protective enclosure for manual fire pull stations designed to block accidental or intentional false activations while preserving legitimate emergency access. This no-horn variant—the STI-3150NR—integrates a spacer and omits acoustic feedback, making it suitable for installations where the pull station already signals through a separate alarm panel or where horn duplication is unnecessary. The clear polycarbonate shield and closed-cell gasket frame operate across –40°F to 250°F, meeting environmental demands in schools, hospitals, nursing homes, retail corridors, and public facilities where false-alarm costs and liability are persistent concerns.
Compatibility
The STI-3150NR fits standard manual pull station openings commonly found in commercial fire alarm systems. Verify mounting-surface dimensions against the Stopper II frame profile before installation. The 9VDC power requirement aligns with typical battery-backed fire safety circuits and remote alarm modules. For oversized or non-standard stations, the separate STI-3100 conduit spacer option provides additional accommodation. The no-label design eliminates custom marking delays—critical for OEM and integrator bulk deployments where lead time matters.
Installation Notes
Outdoor installations require the underlying pull station to carry UL outdoor listing; the STI-3150NR provides environmental sealing via closed-cell gaskets rated for the full polycarbonate operating range. Mounting hardware and gasket replacement kits are sourced separately. Three-year manufacturer warranty covers polycarbonate breakage under normal use; electromechanical and electronic components (battery contact, frame) carry one-year coverage. Pre-installation verification of pull-station dimensions against frame specifications prevents rework.
What's in the Box
- 1x Stopper II polycarbonate shield and frame assembly
- 1x closed-cell gasket set
- 1x integrated spacer
- 1x 9V alkaline battery
- Mounting hardware
