All fuel burner combustion safeguards on gas-fired boilers over 100 HP and oil-fired boilers over 50 HP should be Factory Mutual approved equipment.
Drawings, including section details of wiring and gas train, along with a Factory Mutual Application for acceptance form, shall be submitted to Factory Mutual for review and acceptance prior to installation.
Final approval is based on a satisfactory field test of completed installation.
Gas fired unit heaters up to 400,000 BTUs need AGA approval.