MFD-GB-D-21-A-R UL 555 Fire Damper with Parallel V-Blades
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Product description
The MFD-GB-D-21-A-R is a high-performance fire damper designed to meet the stringent requirements of UL 555 standards. Engineered for critical HVAC applications, this unit features a robust 16-gauge (1.4 - 1.7 mm) galvanized steel frame and parallel-operated 'V' type blades, ensuring airtight closure during fire events. The damper is equipped with a 165°F thermal response device (TRD) that triggers the actuator to close the blades, preventing the spread of flames and smoke through ductwork.
Key Technical Specifications
- Certification: UL 555 tested with a 1.5-hour fire rating.
- Performance: Handles maximum air velocity of 2000 fpm and operating pressure up to 4 in. w.g (1000 Pa).
- Construction: 16-gauge galvanized steel frame and blades with stainless steel jamb seals.
- Actuation: Compatible with Honeywell, Belimo, and Siemens actuators (24V AC, 120V AC, 230V AC).
- Shaft: 12 mm diameter galvanized steel jack shaft with fire-resistant bronze bushes.
Applications & Benefits
This damper is ideal for commercial and industrial buildings requiring compliance with SMACNA, NFPA, IBC, BOCA, and ICBO codes. It supports both factory and field installation options for the sleeve, with thickness adhering to NFPA table 3-4.6.3. The unit includes limit switches for BMS integration and optional features such as retaining angles, silicon rubber blade seals, and external indicators for enhanced monitoring and maintenance.
