Recent results [1] on the indoor air quality of the International Space Station (ISS) show that filtered particles (visible high-contrast metals greater than 1 µm) had an average diameter of 6.3 µm and either had complex morphologies or consisted of multiple metals embedded in a carbonaceous matrix. The most abundant metallic aerosols were aluminum zirconium tetrachlorohydrex (Al-Cl-Zr) alloy, austenitic stainless steel (Fe-Cr-Ni), Kanthal (Fe-Cr-Al), and 4006 aluminum alloy (Al-Si-Fe). Reported analysis omits sub-micron single-component aluminum particles and salts. We will redesign the flow cell of the NanoJet printer head [2] by simulating the survival probability of metallic aerosols as a function of their diameter. By neglecting the gravitational settling and for various flow rates, we will determine aerosol transportation losses due to diffusion during transport to the deposition head. We will identify optimal flow rates and system geometry such that transport losses due to diffusion are minimized for PM2.5 aerosols. New aerodynamic lens and supporting differential pumping system will be designed as a sample inlet for the Spacecraft Atmosphere Monitor (S.A.M.) [3], which will be used as an aerosol vaporizer and chemical composition analyzer. Bibliography [1] M.E. Meyer, Results of the Aerosol Sampling Experiment on the International Space Station, 48th International Conference on Environmental Systems, 8-12 July 2018, Albuquerque, New Mexico; article ICES-2018-100. [2] M. Essien, Apparatuses and Methods for Stable Aerosol Deposition Using an Aerodynamic Lens System US Appl. 14/927380 (2016). [3] S. M. Madzunkov, S. Schowalter, D. Nikolic et al., Progress Report on the Spacecraft Atmosphere Monitor’s Development Model, 48th International Conference on Environmental Systems, 8-12 July 2018, Albuquerque, New Mexico; article ICES-2018-325.