Moe.Red
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Correct sir.You work infront of the hepa so the jars are only exposed to cleaned air. Generally let it run to clean the room air for a period of time is good practice. I built a positive pressure box for $100 because its more economical for a small setup. But a laminar flow hood is the Cadillac
I have a little household hepa filter that I leave running in the booth all the time on low.
Then turn on the big blowers and let them run for 20 minutes while I prep. The air is virtually sterile in the booth, and 99.999% sterile if you stay in the laminar flow. The biggest problem is your person bringing in microbes. Lab coat and gloves, but I always try to do lab work first thing in the AM so I am just out of the shower.