American Gas Lamp Works Cosmopolitan 1600W 21" Charcoal Gray Residential Wall Mount Aluminum Natural Gas Lamp With Single Upright Gas Mantle Light Assembly, Beveled Tempered Glass Panes and Small Ball Finial h33.06 Canada United States Clearance – Size & Description:48" SS Chimney Length Canada United States Clearance – top (measured from the platform on which the appliance is installed)** 80" 80 Clearance – combustible side mantle to unit 8" 8" Clearance – combustible side wall to unit 13" 13" Clearance from the shelf to the base of the fireplace 58" 58" *The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual 21“ Item Weight 42 This requires both Natural Gas and 110 120V electric be run to each fixture and will allow you to control the flame with a light switch or a timer How much light do American Gas Lamp Works fixtures produce