The foolding hood for single-deck tumbler or vibration screening machines can be opened easily, without time-consuming loosening of nuts, and thus considerably reduces the downtimes resulting from frequent product changes. There is also a far lower risk of damage to the mesh cloth, which is often very fragile. Easily operated and adjustable clamping elements with a saftety mechanism ensure that the hood is securely locked and sealed to prevent the escape of dust. The mounting ensures that the hood is positioned correctly on the screen frame when it is closed.