This is the official review class for the Sixth Edition NFI Gas Certification exam. The class is based on the official reference manual for the exam, the Gas Hearth Systems Reference Manual, Sixth edition published Fall 2018. The class will cover installation knowledge specific to gas appliances and venting. This includes regulations and instructions, fuel characteristics and delivery, appliance requirements, venting, ventilation, and troubleshooting. All major gas hearth appliances will be covered including fireplaces, gas log sets, inserts, and freestanding stoves. Venting methods such as conventional type B-vent, direct-vent, liner systems, and vent-free will also be covered.