In this paper results concerning a diffusion experiment on a small scale mo
del of a waste incinerator, carried out in a boundary layer wind tunnel, wi
ll be presented. At the beginning a description of the measurement system t
hat has recently been placed in the wind tunnel will be given together with
a study of repeatability of the measurements results. A comprehensive stud
y of the flow mean characteristics at different position in the tunnel work
ing section will be reported and at the end some vertical and horizontal co
ncentration profiles results will be described and discussed.