Humidity or fresh air flow?

Which is more important, humidity or fresh air flow? I have to pick a medium. If Fresh air fan is on 24 hrs RH drops to 30% with humidifier on max. To keep RH at 50% fan is on 15 mins per hour but growth seems slow. Any tips or do I need to chill haven’t done seeds in a while.

Your plants need constant airflow, are you running a heater or something that is reducing the humidity so low??

Assuming you’re exhausting with a in-line fan.. reduce the speed of your exhaust fan to maintain higher humidity while using the inside the tent/grow space fans to keep that air moving. Another option is run a bigger or two humidifiers to keep up.

John Ames said:

Which is more important, humidity or fresh air flow? I have to pick a medium. If Fresh air fan is on 24 hrs RH drops to 30% with humidifier on max. To keep RH at 50% fan is on 15 mins per hour but growth seems slow. Any tips or do I need to chill haven’t done seeds in a while.

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Both are important. You need some fresh air to replenish co2 used by the plant, but I think its a lot less than people assume. Like Cali said, slow the fan or otherwise reduce the flow. Slow and steady is better than 15 on, 45 off. Many of use use fans controlled by temp and humidity.

Are they young? Larger plants generate a lot of humidity, though it seems you have a dry environment.

You need to give more info on your setup for good advice, lots of variabls. To cool can really slow them down.

Fresh air I grow in like %15 humidity in the winter just fine