The objective of the work was to determine the effects of particle concentration, water condensation rate, particle size, and particle substance on the removal efficiency of an experimental condenser scrubber. The experimental device was a vertically oriented, watercooled, 4-inch-diameter pipe; aerosols of metal oxide particles plus steam were admitted at the bottom. Measurements of particle number concentration and size distribution were made. The data suggest that the water condensed on the particles, the latent heat of vaporization was released to the aerosol, and the particles were swept to the condenser wall by theraiophoresis. It is suggested that a condensation scrubber which takes advantage of particle growth is economically feasible.