Heat-Activated Bottom Fire Bolts for Metal & Wood Doors

Ensure NFPA 80 code compliance with Rockwood Bottom Fire Bolts (BFB), the professional standard for securing fire-rated pairs of doors. Featuring an integrated 230°F thermal trigger, these heat-activated bolts project automatically during a fire event to maintain the door's structural integrity and fire seal. By replacing traditional manual or automatic bottom flush bolts, the BFB series eliminates the need for floor-mounted dust-proof strikes, reducing trip hazards and simplifying installation. Whether securing hollow metal doors with the 18BFB or wood-core doors with the 19BFB, these UL Listed components provide a maintenance-free, "system-ready" solution for high-traffic fire safety openings.

Key Technical Specifications

• Thermal Activation: Melt-away plug triggers bolt projection at 230°F.
  
• Strike-Free Design: Eliminates floor preparation and floor-mounted hardware.
  
• Material: High-strength stainless steel construction for maximum fire resistance.
  
• Compatibility: Must be used in conjunction with a UL Listed top automatic flush bolt.