An adjustable nozzle comprising a nozzle body with an inlet, an outlet and a flow chamber having a smooth bore extending between the inlet and the outlet. Light source 102 emits a white light beam 104 which is focused onto a clear aperture of a recycling integrator 106. A tab is disposed adjacent the sidewall to retain toner or dirt accumulated by the scraper. Each cooling hole includes a curved inlet, a metering section with a constant area and constant width flow cross section, and a spanwise diverging section leading into slot.