Fire Rated Penetration Seal : An opening in a fire barrier for the passage of pipe, cable, duct, and so forth, that has been sealed so as to maintain a barrier rating
NFPA 850 Recommended Practice for Fire Protection for Electric Generating Plants and High Voltage Direct Current Converter Stations, 2000 ed. http://www.nfpa.org/assets/files/AboutTheCodes/850 /850-F2004-ROP.pdf, (Recmm Prac: Fr Prac for Electr Gen Plants and High Voltage Direct Current Covr Stn - Amer) {352 NFC}