Gas Hearth Systems Reference Manual, Sixth Edition, published Fall 2018. The manual covers 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.