The System Sensor DH400OE-1 is a professional-grade weatherproof duct smoke detector enclosure engineered for demanding outdoor and high-moisture indoor environments. This 18" x 12" x 6" NEMA 3R rated housing is fabricated from 14-gauge galvanized steel and finished with a durable gray polyester powder coating to resist corrosion. Designed by veteran engineers, this duct smoke detector accessory allows for the installation of standard indoor-rated detectors in locations exposed to rain, sleet, or snow. The unit features a drop-top shield with seamless construction and UL 268A listed special sampling tube gaskets to ensure an airtight seal and accurate air sampling. Contractors can rely on the pre-drilled internal mounting patterns and bottom-side knock-outs for rapid HVAC fire safety installation. The design includes a slip-on removable cover secured by steel screws and a provision for a padlock to prevent unauthorized tampering with smoke detection systems. Key Benefits: Universal Compatibility: Engineered to fit both current and legacy System Sensor duct smoke detectors, including the D4120 and DNR series. Rugged Weather Protection: Heavy-duty 14-gauge steel construction provides a watertight HVAC enclosure solution for rooftop units and unconditioned spaces. Code-Compliant Sealing: Includes specialized gaskets required by UL 268A to maintain the integrity of the sampling air stream. Site Security: Integrated padlock provisions protect critical fire alarm system components from field tampering or accidental damage. Common Questions: Can I use an indoor-rated duct detector outdoors with this enclosure? Yes, the System Sensor DH400OE-1 is specifically designed to house standard indoor-rated detectors in outdoor configurations, protecting them from environmental moisture and debris. Are sampling tubes included with this enclosure? No, this is the weatherproof steel housing only. Sampling tubes and the actual detector must be ordered separately based on your specific duct width. How do I ensure the unit remains airtight? You must use the provided UL 268A listed gaskets around the sampling tube penetrations and ensure the slip-on cover is securely fastened with the included plated steel screws. This item is not eligible for free shipping. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
