Smooth air from the bottom for excellent combustion. Includes fire guard. Dimensions: Upper diameter 6.3 inches (160 mm) x bottom diameter 4.0 inches (102 mm) x height 3.9 inches (110 mm). Exterior width 6.3 inches (160 mm). Exterior depth 6.3 inches (160 mm). Exterior weight g): 12 oz (320 g).