Found on eBay :Nice cheap airflow regulator and filter bottle $25 shipped.
Clever Eberline design, balanced/bypass regulator allows pump to run at constant speed. Looks like it can control up to 4 CFM.
Some data attached, some of it within an instruction manual for a specific air flow detector, but same device used for all. There is a newer version Rap-3 which I am not familiar with. Something like this might be good for our current project and certainly for other such projects.
Geo
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