Grow tent - Humidity issue

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julzb99

New Member
I'm almost 2 weeks into flowering now and humidity fluctuates between 70-82%. This is my first grow, my tent is 4x4, I'm growing them in 7 gallon fabric pots with 60% coco coir, 25% perlite and 15% peat moss. I feed them calmag and blackstrap molasses 1-2 times weekly and water them once a day, either 1 or 2 litres split between all 4, depending on how wet the soil looks. My light is 450w LED and I have a 60w LED lightbulb next to the 2 shorter plants to help balance the height difference out, I keep them on for 12 hours a day. I have a mini air purifier in there as well. My fan is 17", I keep it on the highest setting. I have a small heater in there too, which I keep on low. This set up has remained the same through out the whole grow. Since the plants have gone into flowering I've been trying to lower humidity. I first started by buying 2 damp rid 2.5lbs., and putting them in the corners of the tent. This didn't do anything at all, if anything it got worse some how. So yesterday I bought a mini pro breeze dehumidifier, it pulls 500-750ml of water per day and has a 1500ml tank. It has filled up its tank about half way in the last 24 hours so it seems to be doing its job but yet again it's not lowering humidity. What do I do? I even switched to feeding my plants with only cold water. I have 6 rooting cuttings as well in the tent now, I'm trying to clone them. Before I put the dehumidifier in there, the tent was the same humidity on the monitor but the walls of the grow tent were soaked. Now they're pretty much dry. I also have a 4 inch carbon filter with an inline fan that I keep on high, I have it venting back into the tent. Leaving the door unzipped drops it to about 45% which is ideal but I've been so good with keeping bugs out and I have a ton in my basement where the tent is so I really don't want to leave it open. Please help, when do I have to have this sorted out by before facing mold or bud rot and what could I do about it?
 

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S

spek9

Well-Known Member
julzb99 said:
Hmm ok, but venting it outside vs inside won't make a difference?
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What do you mean? Venting it outside of the tent, or outside of your house?

Look at it this way... if you don't vent to the outside of the tent, you're recycling very stale air which as Renfro said, can compromise CO2 uptake, and the high humidity will eventually cause mold and other issues. Mold renders the end product useless.

You're very early in flower yet. Once the plants get going, humidity will only increase.

Whenever possible, it's best to vent directly to outside, or at least another room of the building that the tent is in. In some cases neither is possible, so you vent to the room the tent is in. However, circling the air in the tent should be a non-option unless you're running a sealed room with proper humidity/temp control and a CO2 generator, which you're not.
 
J

julzb99

New Member
spek9 said:
What do you mean? Venting it outside of the tent, or outside of your house?

Look at it this way... if you don't vent to the outside of the tent, you're recycling very stale air which as Renfro said, can compromise CO2 uptake, and the high humidity will eventually cause mold and other issues. Mold renders the end product useless.

You're very early in flower yet. Once the plants get going, humidity will only increase.

Whenever possible, it's best to vent directly to outside, or at least another room of the building that the tent is in. In some cases neither is possible, so you vent to the room the tent is in. However, circling the air in the tent should be a non-option unless you're running a sealed room with proper humidity/temp control and a CO2 generator, which you're not.
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Outside of the tent, I can't vent it outside of my house. Will it make a difference in smell if I do this vs recycling the air as I am now?
 
m4s73r

m4s73r

Well-Known Member
This will also vastly depend on the size of your basement. If your only running one light and a good fan you can vent through filter into basement as long as your basement is full and open air. one 1k light and 3 or 4 plants wont be a issue. Chances are your furnace is in the basement and it cycle basement air as well.

I will say that this is not a good idea if you dont have central air. i just live in the assumption that if your growing in your basement you ahve central air. lol
 
J

julzb99

New Member
m4s73r said:
This will also vastly depend on the size of your basement. If your only running one light and a good fan you can vent through filter into basement as long as your basement is full and open air. one 1k light and 3 or 4 plants wont be a issue. Chances are your furnace is in the basement and it cycle basement air as well.

I will say that this is not a good idea if you dont have central air. i just live in the assumption that if your growing in your basement you ahve central air. lol
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I'm confused plz speak to me in noobie lol
 
Muntantlizzardv2

Muntantlizzardv2

Well-Known Member
I tell you this theres a collage on controlling humidity indoors. it mosty depends on the humidity out doors. sometimes all you have to do is get fresh air, other use an AC to bring it down if you can afford a dehumidifier. Idk how to speak noob, and i can also say that school cose me 10k
 
S

spek9

Well-Known Member
julzb99 said:
I'm confused plz speak to me in noobie lol
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I'll try to clear things up... change your venting in whatever way you need in order to have the filter inside the tent, strapped to the top bars. The filter should be as high as possible, as heat rises. Attach your fan to the filter at the top of the tent, so that the intake of the fan is connected to the filter, and the exhaust side is ducted to the outside of the tent. Run as long of a duct as possible to keep the warm air as far away as you can.

Then, make sure that your passive tent intake flaps at the bottom are opened, and turn up the exhaust fan so that you're getting slight negative pressure in the tent (ie. the sides of the tent kind of suck in with the fan blowing).

Done!
 
PadawanWarrior

PadawanWarrior

Well-Known Member
julzb99 said:
Outside of the tent, I can't vent it outside of my house. Will it make a difference in smell if I do this vs recycling the air as I am now?
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At least exhaust it out of the tent if you can't exhaust it straight outside like Ren said. Listen to that man.

And now that I'm exhausting air outside my dehumidifier is collecting dust, lol. I could've saved a few hundred bucks if I knew this before.

And be prepared for it to start smelling, especially closer to the end of harvest. Carbon filter or scrubber will help. My whole house reaked like weed along with everyones clothes my first grow so be prepared.
 
J

julzb99

New Member
spek9 said:
Then, make sure that your passive tent intake flaps at the bottom are opened, and turn up the exhaust fan so that you're getting slight negative pressure in the tent (ie. the sides of the tent kind of suck in with the fan blowing).
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Whats this mean? and wats an exhaust fan
 
J

julzb99

New Member
PadawanWarrior said:
At least exhaust it out of the tent if you can't exhaust it straight outside like Ren said. Listen to that man.

And now that I'm exhausting air outside my dehumidifier is collecting dust, lol. I could've saved a few hundred bucks if I knew this before.

And be prepared for it to start smelling, especially closer to the end of harvest. Carbon filter or scrubber will help. My whole house reaked like weed along with everyones clothes my first grow so be prepared.
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Even with a carbon filter? when did the smell get noticeably worse during whcuh week of flowering?
 
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