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  • STI Steel Web Stoppers Series — Smoke Detector Wire Guards Specifications

    September 08, 2026 3 min read

    Specification sheet for the STI Steel Web Stoppers series of UL Listed wire guards, protecting smoke detectors from vandalism and accidental damage.

    Full text manual (for reference)

    Specification sheet for the STI Steel Web Stoppers® series — UL Listed wire guards that protect smoke detectors from vandalism and accidental damage.

    Overview

    STI borrowed from nature's master builder, the spider, to create a web of protection from vandalism and accidental damage with these UL Listed wire guards. They're constructed of 9-gauge steel wire with a corrosion-resistant polyester coating, or 9-gauge stainless steel wire, and together the series covers virtually every smoke detector model available today.

    Key Features

    • Patented (D368,670) web-like octagon shape of 9-gauge steel wire makes them extremely difficult to break.
    • Helps protect smoke detectors from vandalism and accidental damage.
    • Models to fit virtually all smoke detectors available today.
    • For use in controlled environments (not intended for outdoor use).
    • Steel Web Stoppers have a corrosion-resistant polyester coating (stainless steel models have no coating).
    • Stainless steel models are constructed of 304 corrosion-resistant stainless steel (considered surgical or medical grade).
    • UL Listed to U.S. safety standards (S3504) for any UL Listed detector — does not require any sensitivity adjustment.
    • CSFM (7300-1416:100) Approved (9600 Series only).
    • Tamper-resistant hardware available.
    • Fast and easy installation, with simple removal for servicing the detector.

    Warranty

    Three year guarantee against breakage in normal use. Highly recommended for areas where abuse to smoke detectors is severe. Installation is easy with anchors and screws provided. Models are available for both flush-mount and surface-mount detectors.

    Models Available

    STI-9601 Steel Web Stopper, Low Profile — Flush Mount
    STI-9601-SS Steel Web Stopper, Low Profile — Flush Mount, Stainless Steel
    STI-9602 Steel Web Stopper, Low Profile — Surface Mount
    STI-9604 Steel Web Stopper for Mini Smoke Detectors — Flush Mount
    STI-9604-SS Steel Web Stopper for Mini Smoke Detectors — Flush Mount, Stainless Steel
    STI-9605 Steel Web Stopper for Mini Smoke Detectors — Surface Mount
    STI-9605-SS Steel Web Stopper for Mini Smoke Detectors — Surface Mount, Stainless Steel
    STI-9609 Steel Web Stopper, High Profile — Flush Mount
    STI-9609-SS Steel Web Stopper, High Profile — Flush Mount, Stainless Steel
    STI-9610 Steel Web Stopper, High Profile — Surface Mount
    STI-9712 Steel Web Stopper for Photoelectric Smoke Detector — Surface Mount (Not UL Tested)
    STI-9713 Steel Web Stopper for Photoelectric Smoke Detector — Flush Mount
    KIT-82 Tamper-resistant stainless steel screws, #8 x 1-1/2 in. snake eye (qty. 4)
    KIT-19038 Spanner bit for tamper-resistant screws with 5/16 in. hex drive
    STI-8171 Polycarbonate mounting backplate for flush and surface mount models; recommended for irregular/unstable mounting surfaces such as drop ceilings and beams. Used only with STI-9601, STI-9601-SS, STI-9602, STI-9609, STI-9609-SS, and STI-9610.
    STI Steel Web Stoppers dimensions and technical drawings for STI-9601, STI-9602, STI-9604, STI-9605, STI-9609, STI-9610, and STI-9713 models
    Dimensions and technical drawings for STI-9601, STI-9602, STI-9604, STI-9605, STI-9609, STI-9610, and STI-9713 models, plus UL Listing details and compatible detector models.

    Approvals

    STI-9601, STI-9602, STI-9604, STI-9605: UL Listed No. S3504 for use with Listed low profile smoke detectors; CSFM Approved.

    STI-9609, STI-9610: UL Listed No. S3504 for use with Listed high profile smoke detectors; CSFM Approved.

    STI-9713: UL Listed No. S3504 for use with a wide range of listed photoelectric smoke detectors from System Sensor, FCI, Secutron, EST, Intelligent Systems, Mircom, JCI, ADT, Fire-Lite, Gamewell, Honeywell, and Notifier — see reverse of manual for the complete detector model list.

    Manufacturer: Safety Technology International, Inc., 2306 Airport Road, Waterford, MI 48327, USA · 248-673-9898 · 800-888-4784 · www.sti-usa.com