Fast lighting - Lights fully in less than 5 min. Burns cleaner than wood. 4 burns up to 4 hours (Duraflame fire logs may be burned in all types of indoor, open-hearth fireplaces. They are designed to light fast and burn up to 4 hours when used according to instructions. Variations in fireplace and climatic conditions may alter duration of burn. Heat content is approximately 78,000 BTU. If used in an outdoor fireplace/fire pit, use only in a well ventilated area, and not under any form of cover. Weather conditions and wind may cause the log to produce more smoke and burn for a shorter duration). Tonight's the night. Duraflame fire logs provide a robust, convenient and authentic fire experience. Tonight's the night! America's No. 1 fire log brand. Firewise. Burns cleaner than wood. Duraflame 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 (Source: Dec 2005 Environment Canada/US EPA Reg 5 Content and emission characteristics of artificial wax fire logs). 75% less carbon monoxide (Source: Dec 2005 Environment Canada/US EPA Reg 5 Content and emission characteristics of artificial wax fire logs). 90% less hazardous air pollutants (Source: Dec 2005 Environment Canada/US EPA Reg 5 Content and emission characteristics of artificial wax fire logs). Saves trees. A Duraflame fire log consumes 80% less material than a comparable 3-4 hour wood fire, and burning fire logs instead of wood results in significantly fewer trees cut down for use as firewood. Recycled & renewable. Duraflame fire logs use recycled and renewable wood sawdust and agricultural fibers, saving valuable natural resources. The renewable fibers are mixed with blends of wax and other combustible, renewable materials. Air Quality Advisory (Nov-Feb): Use of this and other solid fuels may be restricted at times by law. Please check 1-877-4no-Burn or http://www.8774noburn.org before burning. www.duraflame.com. Classified UL: Processed solid fuel for use in listed factory-built fireplaces. Duraflame fire logs are suitable for use in UL listed factory-built fireplaces. Made in: USA.