Fire detector

A fire detector, comprising:

• a housing having a base and a lid, said housing being provided with a plurality of circumferentially spaced air inlet openings;
• a wall extending along a portion of the inside of said housing about the circumference of said base so as to define a compartment which defines a center axis and has an open top spaced from said lid and allowing inflow of air entering through said air inlet openings;
• a wire grating covering said top of said compartment;
• a scattered light detector unit and a ionization detector unit arranged together in said compartment, said scattered light detector including a light source defining a principal axis and a receiver defining a principal axis, with said light source and said receiver opposing each other such that their principal axes intersect in a point of intersection which is eccentric to the center axis of said compartment;
• and
• a plastic body positioned between said light source and said receiver along the center axis of said compartment for providing a light trap,
• said ionization detector unit including a holder for a preparation to be ionized, with said holder being attached to a side of said plastic body facing away from said point of intersection of said principal axes of said light source and said receiver.