[Unclecrash]

What is vpd stand for?

[moses wellfleet]

vapor pressure deficit

[meadowman]

awesome thread!!! very educational and i love seeing facts dispelled...lol

[RedBeardy5]

I noticed my sealed rooms were in the 70% humidity range and my passive rooms were around 40-50%. But my sealed room blows the other rooms away. After reading your log I realized your absolutely correct about VPD. So I ordered a couple heavy duty foggers and humidity controls. Thanks for the log!

[Webster10]

Originally Posted by Ichabod Crane

High RH good.

Is it always? I live in a very humid area and I'm pulling air in from outside. The space is 4×2×5. I use a 240cfm booster fan to provide fresh air, another 240cfm to cool the light and provide more airflow and a 190cfm inline for exhaust. Even with a small dehuey I maintain 60%-75% RH. Will I need a stronger dehue or is my airflow good enough to where I won't rot?

[Unclecrash]

Originally Posted by moses wellfleet

vapor pressure deficit

Thanks man off to do a search

[w4tch]

Truly amazing. There is an abundance of useful information in this thread already. Thanks DJM!

[Ichabod Crane]

Originally Posted by Webster10

Is it always? I live in a very humid area and I'm pulling air in from outside. The space is 4×2×5. I use a 240cfm booster fan to provide fresh air, another 240cfm to cool the light and provide more airflow and a 190cfm inline for exhaust. Even with a small dehuey I maintain 60%-75% RH. Will I need a stronger dehue or is my airflow good enough to where I won't rot?

I run 60-80% RH with two times per minute air exchange. Very rarely do I get any mold or PM. Make sure you are not pulling in air from a seriously contaminated area and you should be good.

If you don't mind using eagle twenty I would spray that if you are worried about mold. But no later than the first week of flower. It says it can be used up to the day of harvest on fruit. Some one will get on here in a minute though and say I'm trying to poison you.

It is my experience that high RH makes for heavey strong plants.

Oh and the only time I had mold was when I plucked fans and some of the stem from the fan was trapped in the bud and molded.

[Treetroit City]

Originally Posted by Ichabod Crane

Oh and the only time I had mold was when I plucked fans and some of the stem from the fan was trapped in the bud and molded.

Which brings to to my next question for OP. I assume with a solid canopy you are not doing any defoliating?

That has been my concern with leaf plucking, the droplet of moisture that beads up inside the bud is a great place for mold to take hold.

[DJM]

Originally Posted by Mikell

Sativa smoke, coco, proper temp/RH... I'ma just join the ranks of gawkers and kudo'ers All my favourite things in one place.

thanks man..im a sat head to the fullest..all my grails are 90 days hazes