Fuck me
Just spent some time reading this thread
What a fucking shit show
Subbed for the lolz.
Their not expensive.
I could set you up a filtered to 0.3 microns (Probably closer to 0.1 micron, but I wouldnt want to have to pass an air sample on that promise) Positive pressure space with laminar flow of clean air directly over your work space for around 1.5k (MAXIMUM) for a small underground lab. (That price includes effectively air sealing the space and paying for an air pressure monitor aka DIGITAL Monometer (Manometer, for you americans)
Around 5k for a decent sized sized lab (Multiple work stations and significantly more sq feet)
Maintenance cost of around 200 per month.
No excuses for labs not to have this, especially at that low cost.
I personally hate hoods, they're inefficient/expensive and dont actively scrub the entire environment/protect the space for random exterior airborne particulates.