Not all accidental releases of flammable gases and vapours create explosions; most releases do not find an ignition source and of those that do ignite. most of them generate low or moderate overpressure only (deflagrative combustion). However. when certain conditions are satisfied. https://www.eleanorscholz.com/product-category/food-servicecommercial-kitchen-equipmentfood-preparation-equipmentother-commercial-food-prep-industrialrestaurant-business-3/