yep your right like i said not in my wheelhouse.....my boss says he still has a exchange every 15 min though....so i guess some ppl do some ppl dont
he might mean that the comple rooms air is filtered every 15 min
in sealed rooms you will have a carbon filter with exhaust
and it is just filtering the room in the air
the CO2 is set at a specific level so it only turns on when that level drops
you and I run a filtered passive setup
for me works perfectly
I get enough C02
I am sure I am skilled enough to make giant buds in a Co2 enviro
but that isnt really warranted for me