Problem: Non-invasive ventilatory support is used for COVID-19, but little is known about the associated virus transport This puts healthcare professionals at risk Background: Patients exhale droplets ('micro-bullets') and aerosols ('floating particles') Droplets are launched and driven by exhalation jets and their reach depends on droplet-size, jet-strength and jet-orientation Aerosols, however, stay airborne and viable for hours and can end-up anywhere The aerodynamics and transport of droplets during various ventilatory support methods should be studied to better understand virus transmission Method: Visualisation of passive-tracer transport to reveal the aerodynamics of NHF, CPAP, BiPAP and other methods, using the 3D-printed head of a virtually breathing adult man Results: Jet-extension and -orientation was found to depend on the therapy, settings and leakage In NHF, a small cannula produced an extensive jet (> 1 meter), while dispersion was more limited for a larger cannula CPAP/BiPAP may also produce extensive jets due to venting and leakage Conclusion: Droplet-driven transmission depends on jet-extension and jet-orientation and probably leakage Aerosol transport is inevitable in non-filtered support methods Because all therapies showed extensive jet dispersion, further