Hilfe bei Abluft, zu hohe RLF. Jemand Tipps?

Can't have two exhaust ducts connecting to the same size y duct and expect same flow, essentially will reduce the flow of both, unless both tent exhaust at same time some it will simply reverse back hot air from one to another. Your exhaust dictates the size and rate of flow, but many things in the tent will add resistance to that flow. If you have carbon filter you will need to double the general size of you intake, opening all the bottom flaps is not an answer as you will not create a negative pressure required to reduce the ambient rh%. Negative pressure requires just a little more going out than coming in, enough that the bars begin to bend in but not enough so that they wreck the tent. Done correctly the exhausts will slowly pump out slightly more than what comes in. Rh% will slowly decline as the tent environment becomes a semi closed loop. Most likely either have no Negative pressure from "keeping vents open" to help with airflow or you have added so much resistance (closed off intakes with "not enough airflow") your intake cannot bring in enough air in order to exchange and cool, heat and moisture accumulate faster than your air flow, air exchange must outpaced latent heat during the day and outpaced cellular respiration at night. Increase intake and apply correct ratio to apply correct Negative pressure. Fix the Y junction to 8" instead of the 4" or 6" .