The White Mountain Hearth Ponderosa Refractory Log Set includes for long lasting beauty in your fireplace The Ponderosa log set is a large set that will stack nicely on an Empire Slope Glaze burner And it will look great in firebox without getting lost The logs are carefully crafted to provide you with a realistic looking fire and burn pattern with flickering flames coming up through the stack Unlike a wood fire the vent free logs generate consistent controlled heat without flare ups or die downs A Vent Free Burner may be installed in a vented fireplace for use as a decorative appliance Specifications . Size 18 in . Type of Venting Vented Vent Free. Fuel Type Liquid Propane. BTUs Min Max 26000 32000. Rear Width 17 . Min Depth 14 . Min Height 17 . Front Width 28