Safety and hygiene requirements for the design and manufacture of rotary rack ovens with one or more rotary racks are defined. These ovens are used in the food industry and shops (bakeries pastry-making eyc) for the batch baking of foodstuffs containing flour, water and other additives. Applicable to ovens used only for food products except for those containing volatile flammable ingrediants. The humidity of the air control in the baking chamber is by the production and introduction of steam around normal atmospheric pressure. Experimental and testing machines under development by the manufacturer and domestic appliances are not covered.