Savannah River Collection SRB24 24" Vented Logs Natural Gas/Liquid Propane in. This brand new generation gas log set gives the most realistic look yet. Beautiful natural flames dance and curl around the logs to mirror natures unique design. The Birch gas log set truly looks like a roaring fire.... - Savannah River Collection SRB24 24" Vented Logs Natural Gas/Liquid Propane in.