A UNIQUE LINE OF PATENTED DUAL-AGENT, OVERHEAD FIRE EXTINGUISHERS. NOW FACTORY MUTUAL APPROVED: CFF PRODUCT. Modular units are easy to install and move, no piping or electrical wiring needed. Non-toxic to occupants and environment. For more that 160 years, Factory Mutual has been a leader in property loss prevention testing and standards. At its 1, 500 acre test center, FM provides real-world ...