Canterbury Blue Flame LLS.2440.NG 24 in. Natural Gas Log Lighter - Straight There is a .31 cents per hour energy savings due to the air gas mixing chamber. EPA test lab results - Reduces pollutants in wood-burning fireplaces. The highest quality and Safety product on the market with an Input rating of 20&#44;000. CSA products class 3371 98 - Valves &#40;gas&#41; - General use-certified to U.S. Standards. Applicable Actual inside diameter: 0.335&#34;.