18 Cumberland Char Vent-Free Log Set - Natural Gas. 18" Cumberland Char Vent-free Log Set, Natural Gas, Fits Fireplace Minimum Opening Of 16"h X 28"w X 12"d. The item "18 Cumberland Char Vent-Free Log Set Natural Gas" is in sale since Monday, November 14, 2016. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Fireplaces & Stoves\Decorative Logs, Stone & Glass". The seller is "shopchimney" and is located in Monsey, New York. This item can be shipped to United States.