Fire Stopping Calculator

Select firestopping for penetrations per ASTM E814/UL 1479.

Diameter or largest dimension

Gap around penetrant

T-rating limits temperature rise on unexposed side

Firestopping Ratings

  • F-Rating: Time assembly prevents flame passage
  • T-Rating: Time until unexposed side reaches 325°F rise
  • L-Rating: Air leakage through system (CFM/sq ft)
  • T-Rating required for smoke barriers and temperature-sensitive areas
  • All systems must be UL listed per ASTM E814 or UL 1479