2-hour (Variations in fireplace and climatic conditions may later duration of burn). Burns cleaner that real wood (The 15th Emission Inventory Conference, New Orleans, May 2006 study results show that when compared to firewood, firelogs have: Up to 75% less particulate matter. Up to 80% less carbon monoxide). Compare to Pine Mountain Firelogs (Pine Mountain is a registered trademark of Hearthmark, LLC, a subsidiary of Newell Brands, Inc). Ecologically condensed formula-same 2 hour burn time (Variations in fireplace and climatic conditions may later duration of burn). 100% Quality Guaranteed: Like it or let us make it right. That's our quality promise. UL listed. Processed solid fuel for use in factory-built fireplaces 7L47. For United States, this firelog has been tested by Underwriters Laboratories, Inc. for use in factory-built fireplaces. For Canada, this firelogs has been designed for brick or heavy gauge metal lined masonry fireplaces, UL or cUL or ULC listed fireplaces and fireplace inserts having minimum burning areas of 400 sq in (.258 sq m). Use in smaller appliances may be hazardous. essentialeveryday.com. Made in USA. Assembled in USA of USA and foreign components.