Harvard School of Public Health
Department of Environmental Science and physiology Biology Program
665 Huntington Ave., Boston, MA 02115
Ralph W. Niven, Ph.D. M.R. Pharm S.
Discussion & Conclusions
MicroSpacer® the screen valve delivery system successfully blocks large aerosol particles from impacting the back of the throat while allowing smaller aerosol particles to pass thru., deep into the lungs.