Smoke alarm

Smoke alarm comprising at least one internal chamber, which chamber has at least one opening towards the surroundings, such that air and smoke pass through the chamber, and where means are provided for emitting light and means for detecting said light is provided in or around said chamber, where the change in light intensity registered by the means for detecting generates a smoke alarm, by means of a noise and/or light generating means, wherein the internal chamber is substantially circular, and that the light emitting means are arranged at an angle to the light detecting source, and that along the periphery of the chamber a plurality of air foils are arranged, where the airfoils substantially have a cross-sectional shape corresponding to an airplane wing, and where said airfoils are arranged at an angle relative to an imaginary radius of the internal chamber.