Lloyd Industries 75AH-DY_12X12 Dynamic Fire Damper 12x12

Product Description

The LLOYD INDUSTRIES 75AH-DY_12X12 is a dynamic fire damper built for HVAC systems where supply fans remain running during a fire event. Constructed from 20-gauge galvanized steel, this damper uses spring operation to achieve horizontal blade closure under active airflow conditions. It carries a UL 555 label attesting to its tested airflow rating and maximum static pressure limits under both UL Canada and UL US standards. Licensed HVAC technicians and sheet metal contractors install this unit in duct systems requiring dynamic-rated fire protection at rated wall or floor assemblies.

This damper is intended for residential and commercial HVAC duct installations where dynamic fire dampers are required by code. It is suited for applications in horizontal or vertical orientations, making it adaptable to a range of duct routing configurations. The 12-inch by 12-inch frame size fits standard square duct openings in fire-rated construction assemblies. It is specified where the mechanical system design calls for fans-on fire damper performance per NFPA 90A or local building code requirements.

Key Features

• Dynamic-rated closure: operates under active airflow with fans running during fire conditions
• Spring-operated blade mechanism for reliable closure without external power
• Galvanized steel construction for corrosion resistance in duct environments
• Installs in horizontal or vertical duct orientations
• UL 555 listed under both UL Canada and UL US for fire damper certification
• UL label attests to airflow capacity and maximum static pressure ratings

Compatibility

Designed as an OEM-style replacement or new-installation dynamic fire damper for 12-inch by 12-inch square duct openings in fire-rated wall and floor assemblies within commercial and residential HVAC systems.

Installation Notes

Installation must be performed by a licensed HVAC technician or sheet metal contractor in accordance with NFPA 90A, the International Mechanical Code, and local authority having jurisdiction requirements. Power down the HVAC system and confirm zero airflow before positioning and securing the damper sleeve in the rated assembly opening. Access panels must be provided per code to allow inspection and resetting of the damper blade after any actuation. Do not restrict the blade travel path or alter the spring mechanism after installation.

Technical Specifications

• Damper Type: Dynamic Fire Damper
• Frame Size: 12 inches x 12 inches
• Frame Material Gauge: 20 gauge
• Blade Material: Galvanized Steel
• Blade Material Thickness: 22 gauge
• Orientation: Horizontal and Vertical
• Actuation: Spring operation
• Applicable Standard: UL 555 (UL Canada and US)

Standard Information

• Brand: LLOYD INDUSTRIES
• Manufacturer Part Number: 75AH-DY_12X12