I have 5x 18" oscillating fans in my flower room (co2 room). I run a co2 line to each fan, zip tie to back and have the fan spread the love around. Works perfect imo.
These fans blow across tops of plants.
I also have 5x 10" small round fans on floor pointing up blowing floor air up into the fans. Co2 is heavier than air and sinks.
It's called rain tubing. I run I a pattern along the ceiling. Co2 sinks so you can get creative with floor fans. At the end of the day it isn't to expensive to run.
I ran tubes to each plant, only did it once. I don't know what it did but I had a welding supply store deliver my tanks
My comment is lame, it has no value
If your doing the fan method, a normal aquarium tubing is needed. The co2 will pump out the end of the hose, secured to the back of the fan. The fan will then blow that co2 where ever the fans pointed.
Use the pierced hose to drape around plants only or hanging above.