Duluth Forge Dual Fuel Vent Free Bookshelves-15,000 BTU, T-Stat Fireplace Bookshelf, Dark Wooden Brown Patented Dual Fuel Technology: Liquid Propane and Natural Gas Thermostat Control - Automatically cycles on and off to maintain desired setting 5 realistic hand painted Ceramic Fiber Logs Economical: 99.9% efficient. No outside duct or chimney needed! Product Dimensions: 60 13/16"W x 35 13/16"H x 13 3/8"D