STI Stopper II Series — Dimensions & Technical Specifications

Specifications and technical information for the STI Stopper II® protective cover series — clear polycarbonate covers that guard manual fire alarm pull stations against false alarms and physical damage, with optional warning horn.

How It Works

Stopper II consists of a clear, tamperproof, tough polycarbonate shield and frame. The cover accommodates most manual pull stations, connected to the frame by a cable. When the Stopper II (with horn) is lifted to gain access to the protected alarm, a piercing self-contained 95 or 105 dB warning horn (at one foot) sounds, drawing immediate attention to the area. The cover drops off the frame when lifted, and the horn continues sounding until the cover is snapped back onto the frame or for the life of the battery.

Proven effective for more than 40 years in helping stop false fire alarms without restricting legitimate alarms — ideal for schools, colleges, hospitals, nursing homes, stores, hotels, and public buildings of almost every kind where there's a threat of false alarms.

Key Features

General

• Proven effective for more than 40 years in helping stop false fire alarms without restricting legitimate alarms
• Can guard against physical damage to a manual pull station, with or without the optional warning horn
• Three year guarantee against breakage of polycarbonate in normal use (one year on electro-mechanical and electronic components)

Design

• ADA Compliant
• Larger sizes and surface-mounted pull stations accommodated with the STI-3100 conduit spacer
• Weather models have closed-cell gaskets

Construction

UL Listed to U.S. and Canadian safety standards (also available for custom labeling).

Installation

When covering a pull station outside, UL requires stations to be listed for outdoor use. Typical working properties of polycarbonate: -40° to 250°F (-40° to 121°C).

Electronics

Power source is a 9V DC alkaline battery included on standard Stopper II (remote-powered unit available).

Options

• Optional horn: 95 or 105 dB at one foot
• Standard red units have "In Case of Fire..." label unless specified with "NR" (no label) or "CR" (custom label)

Models Available

Indoor Use

Weather Stopper® — Indoor/Outdoor Rated (with gaskets)

Accessories

Add -NR for no label on horn housing, -CR for custom label, -FR for French labeling, -ES for Spanish labeling. H models available in a 6-pack (STI-1100 & STI-1130 also in a 12-pack).

External Dimensions

• Flush: 7.2"W x 10.2"H x 3.3"D (183 x 259 x 84mm)
• Surface: 7.2"W x 10.2"H x 5.5"D (183 x 259 x 140mm)

Approvals & Testing

• UL/cUL Listed No. S2466
• For fire alarm applications, UL38 requires outdoor-listed stations for outdoor use
• State of California (obtain local fire marshal approval)
• MEA 49-00-E (STI-1200)
• Flush models ADA Compliant; surface models ADA Compliant for operation
• Weather Stopper® versions designed to meet IP54 requirements
• Indoor/outdoor rated station covers, when mounted on a smooth surface, provide a rain-tight seal similar to a 3R enclosure rating

Important Notice

Stopper II "FIRE" models are intended for areas where the incidence of false fire alarms from manual pull stations is high or has proven to be a serious problem. Any disadvantage of this device is more than balanced when one considers the consequences of false fire alarms — especially if fire service personnel and equipment are responding to a false alarm when needed elsewhere for a real fire.

Warning: for RC models, UL Listing does not permit relay contacts to connect to a fire alarm or life safety function. The power supply for horns, per UL Listing, cannot be connected to a UL Listed fire alarm system. RC models contain one set of Form "C" dry contacts, rated 30 VAC/VDC 1 amp.

Warranty

Three year guarantee against breakage of polycarbonate in normal use (one year on electro-mechanical and electronic components).