Empire 6 Pieces Ceramic Fiber Driftwood Log Set With Stones and Locator Pins for 60" Boulevard Vent Free Linear Fireplace watt1800 The co axial vent system has 1000H NG OFD G9B F8P CH The co axial vent system has the exhaust pipe within the air intake pipe which protects any surrounding combustible material from the high temperature of the flue gases as well as preheating the outside air prior to it being introduced to the combustion process you are able to see clear through the flames to the back of the fireplace for a more authentic experience Create a beachfront cottage look with the Driftwood log set – perfectly proportioned to the Boulevard’s lines – plus an assortment of stones Ceramic fiber construction offers durability and longevity