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Seismic Fire Barrier Floor System (FLF/FLFw)

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The Nystrom Seismic Fire Barrier Floor System is recommended for openings up to 24 inches with seismic activity. Constructed of fire retardant materials to contain fires from spreading through joint openings. Available in 1-, 2- or 3-hour ratings. The system installs with tongue and groove process with limited or no caulking requirements.


  • Fire-Rated
  • Thermal: Horizontal and Vertical Movement
  • Seismic Movement +/- 50% Lateral Shear


Model FLF/FLFw
Movement Thermal: Horizontal and Vertical
Seismic: +/-50% Lateral Shear
Mounting Inside: All sizes
Top: 4 inches and greater
Bottom: 6 inches and greater
Joint Size 2 inches to 24 inches
Length FLF: TM/IM 10 Linear Feet, up to 12"; 4 Linear feet, 14" and up
BM 4 Linear Feet, FLF140: 6.5 Linear Feet
Fire-Rating 1, 2 or 3 Hour (3 hour available for 6" and larger joint sizes)
Application Interior
Installation Floor
Compliance UL 2079/ULCS S-115 "FTH" (FTH: Rating Fire, Temperature and Hose)
ASTM-E119, E1399, E1966
BS EN 1366.4
Options Additional Movement, Transitions and Weather Barrier options available upon request
Warranty 1 year

Order Guide

Use the table below to guide specification of available options. The part number components are indicated in BOLD ORANGE text.

at mean T° F
EJN-FLF140-200 FLOOR TO FLOOR/WALL 2" (51mm) 2" (51mm)
EJN-FLF140-300 FLOOR TO FLOOR/WALL 3" (76mm) 3" (76mm)
EJN-FLF140-400 FLOOR TO FLOOR/WALL 4" (102mm) 4" (102mm)
EJN-FLF-400 FLOOR TO FLOOR 4" (152mm) 4" (152mm)
EJN-FLF-600 FLOOR TO FLOOR 6" (152mm) 6" (152mm)
EJ-FLF-800 FLOOR TO FLOOR 8" (203mm) 8" (203mm)
EJ-FLF-1000 FLOOR TO FLOOR 10" (254mm) 10" (254mm)
EJ-FLF-1200 FLOOR TO FLOOR 12" (254mm) 12" (254mm)
EJ-FLF-1400 FLOOR TO FLOOR 14" (354mm) 14" (354mm)
EJ-FLF-1600 FLOOR TO FLOOR 16" (406mm) 16" (406mm)
EJ-FLF-1800 FLOOR TO FLOOR 18" (457mm) 18" (457mm)
EJ-FLF-2000 FLOOR TO FLOOR 20" (508mm) 20" (508mm)
EJ-FLF-2200 FLOOR TO FLOOR 22" (558mm) 22" (558mm)
EJ-FLF-2400 FLOOR TO FLOOR 24" (609mm) 24" (609mm)
EJN-FLF-400W FLOOR TO WALL 4" (152mm) 4" (152mm)
EJN-FLF-600W FLOOR TO WALL 6" (152mm) 6" (152mm)
EJ-FLF-800W FLOOR TO WALL 8" (203mm) 8" (203mm)
EJ-FLF-1000W FLOOR TO WALL 10" (254mm) 10" (254mm)
EJ-FLF-1200W FLOOR TO WALL 12" (254mm) 12" (254mm)
EJ-FLF-1400W FLOOR TO WALL 14" (354mm) 14" (354mm)
EJ-FLF-1600W FLOOR TO WALL 16" (406mm) 16" (406mm)
EJ-FLF-1800W FLOOR TO WALL 18" (457mm) 18" (457mm)
EJ-FLF-2000W FLOOR TO WALL 20" (508mm) 20" (508mm)
EJ-FLF-2200W FLOOR TO WALL 22" (558mm) 22" (558mm)
EJ-FLF-2400W FLOOR TO WALL 24" (609mm) 24" (609mm)
Additional options available, call for more information.


NYSTROM warrants the Seismic Floor Fire Barrier System to be free from manufacturing defects in materials, factory finishes, and workmanship for a period of five (5) years from the date of shipment.

Should a product fail to function in normal use within this period, Nystrom shall furnish a replacement or new part at Nystrom's discretion. Failure to use product in methods consistent with Nystrom product manuals shall relieve Nystrom of any liability. Our liability under this warranty excludes installation or removal costs involved in the product replacement and excludes any responsibility for incidental or consequential damage of any nature.

For information on a warranty claim, please visit our Warranty Support section or call 800 547-2635.

Warranty Support


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Description Model Shop Drawing CAD Revit/BIM Data Sheet 3-Part Specs LEED Installation Warranty
Floor to Floor/Corner – Inside Mount EJN-FLF140-200 to 400 PDF DWG PDF PDF PDF
Floor to Floor – Inside Mount EJN-FLF-400 to 2400 PDF DWG PDF PDF PDF
Floor to Wall – Inside Mount EJN-FLF-400W to 2400W PDF DWG PDF PDF PDF
Floor to Floor – Bottom Mount EJN-FLF-600-BM to 2400-BM PDF DWG PDF PDF PDF
Floor to Wall – Bottom Mount EJN-FLF-600W-BM to 2400W-BM PDF DWG PDF PDF PDF
Floor to Floor – Top Mount EJN-FLF-400-TM to 2400-TM PDF DWG PDF PDF PDF
Floor to Wall – Top Mount EJN-FLF-400W-TM to 2400W-TM PDF DWG PDF PDF PDF


Interior Floor
Material Type:
Fire Barrier
Movement Type:
Seismic, Thermal