Flue Stack,18 In. H Model Number HVF110, HVF210, HVF310, HVF410, Overall Height 18 in, Overall Length 18 in, Overall Diameter 6 in, Vent Diameter 6 in, Thickness 0.03 in, Vent Type B Vent, Maximum Operating Temperature 350 Degrees F, Material Aluminum, Includes Rain Cap.