Quicklite for faster and easier lighting. More warmth. More time. More life. Concentrated formula. Clean burn technology. 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 a downdraft could cause a fireplace malfunction. If you suspect that your unit is not functioning properly, a qualified contractor should be consulted. (Variation in fireplace and climatic conditions may alter duration of burn). Clean burn technology. Burns cleaner than real wood. Up to 75% less particulate matter. Up to 80% less carbon monoxide (15th Emission Inventory Conference, New Orleans, May 2006). UL listed. Assembled in USA of USA and Canadian components.