STI Stopper II® Heated Enclosure – Cold Weather Protective Covers
The STI Stopper II® Heated Enclosure is designed to protect fire alarm pull stations and other sensitive devices in extremely cold or harsh environments. Made from heavy-duty UV-stabilized polycarbonate, this enclosure features a built-in heater and continuously running fan to maintain internal operating temperatures down to -70°F (-57°C). Ideal for outdoor installations, walk-in freezers, or any location where temperatures drop below the rated range of UL Listed devices, the Stopper II Heated Enclosure provides reliable protection against false alarms, vandalism, and weather damage while maintaining full device accessibility in an emergency.
Key Features
- Maintains operating temperature with heater and fan for devices in extreme cold (-70°F/-57°C)
- Durable, UV-stabilized polycarbonate cover prevents damage and discoloration
- NEMA 3R rated enclosure for outdoor and indoor harsh environment applications
- Available in 110 VAC and 240 VAC heater models
- UL and cUL Listed for U.S. and Canada
- Three-year warranty on polycarbonate; one-year on electro-mechanical components
- Continuously running fan ensures uniform heat distribution
- Includes back box, heater assembly, and mounting hardware
- Ideal for fire alarm pull stations, addressable modules, and other critical devices
Manufacturer Resources
Product Specs
- Accessories:
- Adapter Plate (KIT-314), Conduit Hub (KIT-H18021), Replacement Heater (STI-HK3)
- Applications:
- Outdoor fire alarm stations, freezer rooms, harsh climates
- Certifications:
- UL/cUL Listed, ADA Compliant
- Fan:
- Runs continuously to distribute heat evenly
- Heater Options:
- 110 VAC or 240 VAC
- Material:
- UV-Stabilized Polycarbonate
- NEMA Rating:
- NEMA 3R
- Parent SKU:
- STI-STOPPER-II-HEATED-ENCLOSURE
- Product Line:
- STI Stopper II® Heated Enclosure Series
- Warranty:
- 3-Year Polycarbonate; 1-Year Electro-Mechanical Components
- Operating Temperature:
- Maintains device operation down to -70°F (-57°C)
Parts & Accessories