How high should be the chimney of a crematory? The height of a crematory chimney is per country different. Take for instant The Netherlands her a crematory chimney should be at least 50 cm higher then the highest point of the crematorium. We take into account that rules and legislation can change so we use a 80 cm till 100 cm chimney. Again the hight of a chimney can be different per country, please get in touch with your own government to know what your local legislation is. The chimney of a cremation furnace with cremation filter installation is situated behind the filter system.