Humidity

I have tried everything to raise my humidity!! From filling up bowls with water, hanging wet towels, rearranging the air flow of tent. I have resorted to buying a humidifier! Still LOW HUMIDITY!!! Grow tent temp is about 24 degrees Celsius and the humidity is around 35%

I have a 2m x 2m x 2m (metres) grow tent with four 600W HPS Slyvania Lights.

Originally I had my intake/ducting coming in from the window and the exhaust fan exhausting the air outside the room into the rest of the house. I then added the humidifier into the tent and noticed not much difference in RH. I then moved the intake away from the window as I think that the cold air coming in from outside is not helping with the RH. Now the intake/ducting is taking in air from the room rather than directly from the window, plus I put the humidifier next to the intake.

Still no increase in humidity. I have been trying to fix this issue for weeks now!!! PS: I am going into 5th week of veg.

Any advice to help with humidity issues.

Thanks

If you are using the air intake to bring air into the room, and exhausting that air then the RH in your room will always be close to what it is outside. If you bring outside air into a room you will always having account for the reality of the outside air's RH. Honestly, bringing in fresh air into a room although an inexpensive way to cool during hot seasons, unfortunately is the least effective way to control your environment effectively due to variances in temperature and RH outside day to day.

If your temps can handle it, slow down the exhaust. That's what I did in my veg. Then the fan broke because it did not like the speed governor thing, so I got the closest fan speed I could to what I wanted and then ended up running 2 humidifiers. Good luck man!

CaptainCAVEMAN said:

slow down the exhaust.

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Would that not create a positive pressure within the grow tent??

Harajuku Element said:

Would that not create a positive pressure within the grow tent??

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Slowing down the exhaust would create positive pressure inside the tent if you didn't slow down the intake. If the intake is active, it would need to be slowed down as well to prevent a pressure difference. If it's passive, it ultimately wouldn't matter.

The best answer is to work in a sealed environment where there is no fresh air exchange and thus your conditions are 100% under your control instead of dependent on variable air temp and humidity. Of course, you would need to supplement CO2 since you would no longer have fresh air, but this would allow you to easily raise the humidity without the air exchange continually dropping your humidity.