Quadra-Fire's wood fireplace inserts are built to get the most possible heat out of your firewood. The patented four-point combustion system creates beautiful fire and unmatched efficiency that have made Quadra-Fire famous. In fact, for 20 straight years, Quadra-Fire has produced the cleanest-burning line of non-catalytic wood appliances available, as rated by the EPA. At Quadra-Fire, being environmentally-friendly isn't a trend - it's the tradition.