humidity with passive intake
- Thread starter S13hitman
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ttystikk
Well-Known Member
THIS. You'll see the room heat up less than you think, because the plants will transpire a bunch of water. This soaks up a lot of additional heat. The bigger the plants and more efficient your setup the better this works. I'm constantly battling excessive RH, even while my temps are marginally too COOL- and I'm running high wattage HID lighting.
Thanks you two. That does help me with a direction to take. My 6" inline fan is dialed down to medium and then whines since it's stressing the motor when turned any lower. I'll have to work around that but I totally understand that more vegetation will make the RH go right up.
So ill be adding more plants with a shorter veg time next run.
So ill be adding more plants with a shorter veg time next run.
ttystikk
Well-Known Member
If it's a muffin fan it shouldn't be a problem but if it's brushless like Maxfans are, you need to take it off the speed controller or you'll burn it up.
Maat Aatack
Well-Known Member
I have battled low RH and came up with a really good solution. It was cheaper and more effective than my humidifier. Check out my sig line... It's in that current grow early on.
Basically how I won the humidity battle is I built a frame out of 3/4 inch pic pipe, drilled holes in the top of the top cross pipe, installed a submersible pump onto one "leg" of it, draped a towel over it, filled the tote with water and turned it on. The water cascading down the towel gets blown by a fan. Turn your vent fan on idle at low temp or at lights out to build up humidity at that time. I went from 30% to 60-70 %. When the lights come on you hopefully have enough ambient humidity to carry you through the day.
Basically how I won the humidity battle is I built a frame out of 3/4 inch pic pipe, drilled holes in the top of the top cross pipe, installed a submersible pump onto one "leg" of it, draped a towel over it, filled the tote with water and turned it on. The water cascading down the towel gets blown by a fan. Turn your vent fan on idle at low temp or at lights out to build up humidity at that time. I went from 30% to 60-70 %. When the lights come on you hopefully have enough ambient humidity to carry you through the day.
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It stresses the motor and shortens the life span. However I can't run that damn thing at full power.
Outstanding! I just tried something similar and it raised it a descent amount just need a little more. I'm going for the VPD if anyone knows what I'm talking about. Forgot what it stands for but I have the chart if anyone wants it. It shows EXACTLY where your RH should be compared to your ambient temps. Most people recommend low humidity and that's normally not the case unless your literally approaching harvest time.
I just took a 5g bucket and drilled holes around the top. Draped a towel in the bucket to soak up water without a pump and then put a fan in the lid blowing into the bucket. Basic swap cooler without going to the store and getting a few other things to make it better. Just trying for the time being but it did work as you stated. Nice point on building it up for the day.
Thank you
Red1966
Well-Known Member
Get a smaller fan then.
Your all great. Thanks. Thinking I should have went with a tent and not a closet. You were right it is a small space and that 6" is probably overkill. I'm about to move in 30 days so I'll be redoing things anyway but I'm at a critical point and need things to go well.
If I went with a tent and got another smaller inline fan I'd be able to run the light by itself just straight through a tent and then use the other fan when temps and RH is too high. Just don't want to step for a good controller yet. Any one recommend an inexpensive way to control the exhaust fan to turn on when it should? The other fan for the lights is obviously on 24/ 7 but probably don't need a controller for that since it could run at 100% power.
If I went with a tent and got another smaller inline fan I'd be able to run the light by itself just straight through a tent and then use the other fan when temps and RH is too high. Just don't want to step for a good controller yet. Any one recommend an inexpensive way to control the exhaust fan to turn on when it should? The other fan for the lights is obviously on 24/ 7 but probably don't need a controller for that since it could run at 100% power.
Carolina Dream'n
Well-Known Member
I follow vpd in veg and first 3 weeks of flower. It scares me after that point.
ttystikk
Well-Known Member
Face your fears... the growing force is with you.
Did you know that if you get powdery mildew wet, it dies? Just get it thoroughly wet.
whitebb2727
Well-Known Member
I run brushless on a 3 amp variac no problems. My rh runs low. It's a small cab but I prefer low rh.
If you look at some people's journals that follow VPD all the way through you'd probably be getting a better gpw ratio. That's a big deal for a small cab grower. Also, all you need is extremely good airflow through the plants and wind blowing crazy. Your plants will drink normally or better than they were. I'm watching mine change by following the chart as close as I can. I'm at 65% now and still want another 7% more for optimal growth.
Obviously a few above do follow that rule except when flushing and harvesting.
Obviously a few above do follow that rule except when flushing and harvesting.