A lawnmower 10 is disclosed, comprising a chassis 20 including a cutting chamber 21, a cutting blade rotatably mounted within the cutting chamber, and a motor 30 mounted to the chassis above the cutting chamber which in use drives the cutting blade. Air-inlet apertures 26 are provided between the chassis and the motor to allow air to be drawn into the cutting chamber. A plurality of spaced-apart projections 40 are provided which extend into each aperture in order to partially obstruct the aperture and prevent the ingress of objects of a predetermined size into the cutting chamber. The projections 40 are formed integrally with the motor casing and extend outwards towards the chassis. They can also function as cooling fins for the motor 30. The upper surface of each projection slopes away from the motor so that debris falls towards the end of each projection and is drawn into the cutting chamber through the aperture at the ends of the projections.
