I'm setting up a small packaging operation for edible products for pets. There are certain government standards we have to hit to be able to do this.
The actual packaging takes place in a 420 sq ft room with 12 ft ceilings. It's all well sealed with a single door for entry and exit, that is itself pretty well sealed when closed.
In order to pass inspection we need to be able to demonstrate that the room is pressurized. There isn't a specific differential we need to maintain, we just need to be able to pass a smoke test at the door. The air needs to be filtered as well. It doesn't even have to be HEPA, just filtered. Pretty much I just need to be able to blow filtered air through the wall from the main area into this packaging room and get it nicely pressurized.
I spoke with one engineer who said "You don't need me for that, just get whatever you want and install it". He was pretty curt. I've been looking around and all I can find are inline duct fans for grow-ops (that sound like jet engines) and little bathroom fans.
What's my best bet for solving this problem? I know there isn't much to worry about in terms of installation, I'm just trying to avoid buying and installing something only to discover it's completely inadequate.