Air Duct Diameter: Approx.47mm / 1.85 Hand crank blowers are not easy to damage, wear-resistant and high-temperature resistant Hand crank blower has strong structure, small size, light weight, large wind and beautiful appearance It much convenience to make for charcoal grill, bbq, campfire and, great for outdoor barbecue and picnic No battery, no additional firewood required, Manufacturer: yanwuwa