Stainless steel flue lengths are 900mm in length and crimped at one end. They come in a range of sizes from 4" (100mm) diameter to 16" (400mm). Flomet 6? (450mm) flue half lengths are also available.Delivery Time : Please allow 2-3 weeks for this item to be processed and dispatched from our warehouse. Once your order has been dispatched the tracking details shall be forwarded to you.