Humidity Control

My grow space is getting quite large. 2 - 3x12 tables and 1 - 3x8 table. So humidity is becoming an issue. I have been looking for some solutions. I found a link to something that might be of help. Anyone ever use products by tjernlund? specifically the X2D model?

http://www.tjernlund.com/Tjernlund_Crawl_Space_&_Basement_Ventilation_Fan_Lit_8500720.pdf

Other options? I want to get in front of this before it becomes a real problem.

its a humidistat hooked to a fan basically.ive installed something similiar on the first floor of a building that was built into a hill.very damp spot that had that basement smell.from what i remember,the manufacturer recommended leaving a window open(cracked) on the second floor for airflow and to replenish air.this made no sense to me if it was humid outside??i can understand that way of thinking in a crawlspace,trying to evacuate stale air.maybe someone could clarify that.not sure this would fit your application,or if the model youre looking at requires that(a cracked window,or make-up air)

I think that the only way to regulate RH is by using an A/C unit. When the interior air is chilled by the evaporator it drops the air temp enough to fall below the dew point and you get condensation. Other than artificial climate control, if the ambient outdoor RH is low then venting should work.

Surefire easy solution is a dehumidifier. They often have ports that you can plug a hose into so you don't have to keep dumping the bucket out, just route the house outside. $200, plug it in and you're done. I have a GE 40 pint that keeps my 2 cat garage at a comfy 50%, even when it's acting like a tropical rainforest outside.