4 hour (Variations in fireplace and climatic conditions may alter duration of burn). Fast, easy lighting. Simple, no mess. Clean burning. Fireplaces. Fire pits. Campfires. Crafted from real hardwoods. Burns cleaner than cordwood. If your fireplace is functioning properly, emissions of this product should be vented outdoors. A properly installed and maintained fireplace and chimney will dramatically reduce the likelihood of combustion by-products entering your home. An inadequate air supply or downdraft could cause a fireplace malfunction. If you suspect that your unit is not functioning properly, a qualified contractor should be consulted. Your mountain retreat begins. UL Classified. www.pinemountain.com. Learn more about Pine Mountain Firelogs at www.PineMountainFire.com. These firelogs are made with recycled biomass products such as hardwood sawdust and ground tree nutshells. Up to 75% particulate matter (15th Emission Inventory Conference, New Orleans, May 2006). Up to 80% less carbon monoxide (15th Emission Inventory Conference, New Orleans, May 2006). Made in USA with wrappers from Canada.