FFU units are air handling units with a built-in speed controller that filter down to .3 microns just like the flow hoods
cons
they don’t flow as much air as the complete flow hoods.
They dont have a work area to work inside of
Pros
they are a cheaper starting point to get a larger work area for working with bags standing up
Complete flow hoods
These are the same filter fan combos we have been using in our farm for 15+ years
cons
do cost more
need a 61×61 for working with Bags standing up minimum
Pros
Work area to work inside of
plenty of airflow – our latest batch of fans have built in speed controllers
thicker filters so last longer
we use these same setups in our farm