MSD-GB-21C3-A-R UL-555S Class III Fire & Smoke Damper

The MSD-GB-21C3-A-R is a high-performance fire and smoke damper engineered to meet the rigorous requirements of UL-555S standards. Designed for critical HVAC applications, this damper provides reliable containment of fire and smoke, ensuring safety in commercial and industrial buildings. It features a robust construction with a 16-gauge galvanized steel frame and parallel-operated 'V' type blades, ensuring minimal leakage and maximum durability.

Built to withstand extreme conditions, the damper offers a maximum operating pressure of 4 in. w.g (1000 Pa) and a maximum velocity of 2000 fpm. The thermal response device (TRD) is rated for 165°F, allowing for automatic closure in the event of a fire. Compatibility with leading actuators such as Honeywell, Belimo, and Siemens ensures seamless integration into Building Management Systems (BMS) for precise open/close indication and manual reset capabilities.

Compliant with SMACNA, NFPA, IBC, BOCA, and ICBO standards, this damper is suitable for both rectangular and round duct connections via optional transition necks. The unit includes silicone rubber blade seals and stainless steel jamb seals for enhanced airtightness, making it an ideal choice for fire-rated partitions and ductwork in high-rise and industrial facilities.

• UL-555S Certified: Class III leakage rating for superior fire containment.
• High-Pressure Capability: Operates up to 4 in. w.g (1000 Pa) at 2000 fpm velocity.
• Durable Construction: 16-gauge galvanized steel frame and blades with stainless steel jamb seals.
• Smart Integration: Compatible with 24V/120V/230V AC actuators for BMS control.
• Compliance: Meets NFPA, SMACNA, and IBC standards for fire safety.
• Optional Features: Stainless steel construction available for corrosive environments.