All my stuff for the indoor greenhouse was purchased at bustan here in toronto. I am using a 4" inline vortex fan that runs 172 CFM and sits near the top a bit to the side of the light to suck up the heat coming off of it, seen here:
Bustan - Toronto Hydroponics Grow Lights Nutrients Hydroponic Supplies Canada I use 2 fans to circulate the air around the plants, the main fan is a stacked model that is 2 fans in one seen here:
Canadian Tire and the other is a small vornado space heater I have that just has a fan option and is sitting in the other corner blowing more air around. I grew the plants in vegetative state in the rez for about 5 weeks or til the plants were about 12-20 inches tall.
Bionic in case you missed it again, $190 for the bubbler and it hits really smoothly