id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-262920-yjsl6kck	Schilling, Katherine	An accessible method for screening aerosol filtration identifies poor-performing commercial masks and respirators	2020-08-06		.txt	text/plain	5392	249	45	With the intent of evaluating filtration efficiency without purporting to replicate NIOSH equivalency, the methods designed in this study are aimed at testing masks with relevant, reproducible aerosol distributions at face velocities appropriate for human respiration. and for the purposes of this study was further substantiated by measuring across a series of dilution factors (with and without mask material in place) to gain multi-point measurements across a range of test aerosol concentrations at a given face velocity (see Section S4 and Fig. S6 ). We also evaluated a rapid screening approach with the understanding that initial screening of large inventories is necessary to determine which masks/respirators warrant further testing and also that some communities and facilities may be constrained in terms of available instrumentation for aerosol measurement and flow control. The methods presented here rely upon regular comparisons to NIOSH N95 benchmark masks, as absolute filtration efficiencies will vary with changes in flow rates and aerosol sizes measured (e.g., Fig. 5 ).	./cache/cord-262920-yjsl6kck.txt	./txt/cord-262920-yjsl6kck.txt