Abstract: A spin chamber for use in an inhaler includes a primary recess to receive air to mix with contents of a capsule. The primary recess has a curved wall. The spin chamber includes a secondary recess to hold a capsule. The secondary recess is located within a bottom surface of the primary recess. The spin chamber includes at least one curved inlet channel to allow air to travel therethrough. The curved inlet channel includes a tangential section and a funnel section. At least a portion of the tangential section is substantially tangential to the curved wall of the primary recess and is connected to an air inlet on an exterior surface of the spin chamber. The funnel section curves toward the primary recess and is connected to an entry point to allow air to enter therethrough into the primary recess.