The flap valve (20) has an engine compartment (22) associated motor (2), a vehicle undercarriage and a cooler (5) for cooling the motor by a cooling air. An air guide channel is arranged between the cooler and the motor for cooling air. An inflow of cold a...

A sound absorption case or panel for e.g. an automobile engine has numerous apertures or slits (3). The holes are surrounded by volcano-like raised curved edges. The radius of curvature is between 0.5 and 5 mm. Also claimed is an embossing and punch proces...