Humidity at night Help

[cypher420]

As of right now i've got a tent grow with ventilation and everything and i'm on my 12/12. During the light time the humidty is constant around 45-50% humidity. At night I turn everything off (including exhaust fan) and patch up the vent holes so no light can come in. the problem with this is at night the humidity in the tent is reaching up to 70% which i'm assuming can be bad and cause mold.

should i be keeping my exhaust fan on all night as well? only problem with that is in the morning the area outside the tent gets a bit bright and could leak light in thru vent holes which would need to stay open for airflow.


any suggestions?

[bigsby]

You are right to be concerned with the humidity. It is at the upper threshold. It probably will not present problems during veg and early flower, however, once denser buds develop you could easily face bud rot.

You can mitigate light leaks by creating a 90 degree elbow in your ducting after it leaves the tent.

[medicatedman]

I am not sure why you turn thing of all night the plants still need air circulation and temps to be kept between 72-76%. :stoned:

[SpaceNeedle]

As of right now i've got a tent grow with ventilation and everything and i'm on my 12/12. During the light time the humidty is constant around 45-50% humidity. At night I turn everything off (including exhaust fan) and patch up the vent holes so no light can come in. the problem with this is at night the humidity in the tent is reaching up to 70% which i'm assuming can be bad and cause mold.

should i be keeping my exhaust fan on all night as well? only problem with that is in the morning the area outside the tent gets a bit bright and could leak light in thru vent holes which would need to stay open for airflow.


any suggestions?
Just like you, plants like to have fresh air even when they sleep. You need to keep fresh air for them, and there should be a fan inside to blow across the plants. If there is light coming out the vents, you will need to remedy it, and I would try it first by buying a can of FLAT (non reflective) black spray paint. WalMart has them for 99 cents a can. Then spray the inside ends of the vent pipe. Other methods also work.

[cypher420]

vent pipe like just those kinda heavy hard plastic 90 degree ones? I've seen those around but the largest they come in is 4inches. i have 6inch holes but i guess i can fill it in with something.

[bigsby]

They make 90 degree elbows out of flashing but you can just as easily bend flexible duct into a 90 elbow.

[TheChameleon]

A little light leakage at night time is not going to harm a grow think of the moon lite??? Humidity definitely will...

[cypher420]

They make 90 degree elbows out of flashing but you can just as easily bend flexible duct into a 90 elbow.

thats a good idea! i got lots of ducting. do i still need to spray paint the inside of the ducting?

[cypher420]

A little light leakage at night time is not going to harm a grow think of the moon lite??? Humidity definitely will...

lol good point. i'm keeping the fan on now so the night humidity ranges from 45-55% now.

[bigsby]

thats a good idea! i got lots of ducting. do i still need to spray paint the inside of the ducting?No.

[keylime]

No.

You don't have to paint the inside of your pipe. Spaceneedle was just saying that if you are worried about light. Anything shiny will reflect light, a matt black will not. The pipes and elbows he mentioned are used in the heating and ventilation of homes, and the inside is much smoother than the flexible which is ribbed. Smooth pipe gives less resistance to air than does the flexible stuff for that reason. The elbows are adjustable so they can be anywhere from 90 degrees to straight. Lowes and HD have them and are about $2 each for 6"

keylime