In a pyrotechnic plant, a blast struck during the destruction of recreational fireworks measuring < 75 mm in calibre. Shortly after ignition, a 74-mm electric nozzle would have burst and caused a chain reaction of the other products, spraying around materials on fire. The burning place was partially destroyed; its metal sheets were projected up to a distance of 50 m. Pyrotechnic experts note the need to destroy small quantities of material at a time, knowing their fire responses and effects at best. Defective or older products should be destroyed in an open air zone without confinement.