It much convenience to make for charcoal grill, bbq, campfire and, great for outdoor barbecue and picnic No battery, no additional firewood required Air Duct Diameter: Approx.47mm / 1.85 This fan does not need electricity,, widely used in leisure barbecue,, small stove and so on Hand crank blower has strong structure, small size, light weight, large wind and beautiful appearance, Manufacturer: Tsophreniq