NGP L-1900 FLDL Fire Rated Steel Door Louver | Fusible Link Privacy Vent

The NGP L-1900 FLDL Fire Rated Steel Door Louver is a critical life-safety component designed for high-traffic commercial environments. Engineered for 1-3/4" thick hollow metal and wood fire doors, this louver features an automatic closing mechanism activated by a 165°F fusible link. It serves as the definitive solution for door restoration in fire-rated corridors, providing necessary ventilation while ensuring the fire barrier remains intact during an emergency.

Constructed from heavy-duty 18-gauge cold rolled steel, the L-1900 FLDL is a vital solution for door security and code compliance. The adjustable "Z" blades are held open by a stainless steel spring, which releases the blades to snap shut when heat triggers the fusible link. This louver is an essential component for any solution for door surface repair, as the self-attaching frame provides a professional, clean border that maintains the structural integrity and UL rating of doors rated up to 90 minutes.

Key Features & Performance

• UL Certified Fire Protection: Fully compliant with ANSI/UL10B and ANSI/UL10C (Positive Pressure), suitable for application on fire doors rated up to 90 minutes.
  
• Automatic Thermal Activation: Features a 165°F fusible link that triggers the blades to close, preventing the spread of flames and smoke.
  
• Rugged Steel Construction: Both the frame and adjustable "Z" blades are made of 18-gauge cold rolled steel, providing a permanent solution for door edge reinforcement.
  
• Optimized Airflow: Maintains a 40% free area when open, ensuring balanced HVAC performance without sacrificing fire safety.
  
• Reinforced Durability: Mitered corners are secured with internal reinforcing clips for maximum stability in high-use industrial and institutional settings.
  

Technical Details & Specifications

• Brand: National Guard Products (NGP)
• Model Number: L-1900 FLDL
• Material: 18-Ga. Cold Rolled Steel (Frame & Blades)
  
• Finish: Gray Primer (GPZ) Powder Coat
  
• Fire Rating: Up to 90 Minutes (Hollow Metal or Wood Doors)
• Sizing Requirement: Order size is the cutout size. The unit is manufactured 1/4" undersized to ensure perfect clearance.
• Available Sizes: Minimum 10" x 6" up to a Maximum of 24" x 30".
  
• Fasteners: Includes #8 x 3/4" Phillips head SMS. For high-security environments, reinforcing the installation with thru bolts or security-grade fasteners is recommended to prevent unauthorized tampering with the fire safety assembly.
  

Why Choose the NGP L-1900 FLDL?

The NGP L-1900 FLDL is the professional’s choice for meeting strict IBC, NFPA 80, and NFPA 252 standards. While standard louvers cannot be used in fire-rated assemblies, this fusible link louver provides a legal and safe solution for door restoration. It delivers the industrial-grade reliability, life-safety protection, and polished professional appearance required for hospitals, schools, and multi-family residential complexes.