Burns Cleaner than Wood Crackleflame® fire logs light faster and burn more completely than firewood, and because far less material is consumed when burning a fire log, significantly fewer pollutants are emitted than a comparable wood fire. 80% less fine particles 75% less carbon monoxide90% less hazardous air pollutants Saves Trees Crackleflame® fire logs use only recycled wood and agricultural fibers, saving valuable natural resources. A Duraflame® fire log consumes 80% less material than a comparable 3-hour wood fire, and burning fire logs instead of wood results in significantly fewer trees cut down for use as firewood. Made from 100% Renewable Resources: Crackleflame® fire logs are made with a 100% renewable blend of wax and recycled biomass fibers, including a natural seed to produce the crackling sounds. No petro-chemicals are used.• Lights fully in less than 5 minutes• Burns up to 3 hours*• Natural crackling fire sounds Duraflame® fire logs may be burned in all types of open-hearth fireplaces. They are designed to light fast and burn up to 3 hours when used according to instructions. Variations in fireplace and climatic conditions may slightly alter duration of burn. Heat content is approximately 60,000 BTU. Burns up to 3 Hours* Fast Lighting Crackling Fire Sounds Burns Cleaner than Wood Lights Fully in Less than 5 Minutes USDA Certified Biobased Product