How to raise humidity w/ ventilation

[floppyfundanglr]

Can the negative pressure of most ventilation setups cause a flux in the reading. Maybe....

peace

 

[anonymiss12345]

The 'dry' heat in the room drops the RH of the outside air as soon as it enters and will balance out very quickly to a happy medium when it's raining out.

floppy...RH will drop when the exhaust is on, and if you have a big enough humidifier or the plants are large enough and transpiring enough...the RH will rise as soon as the exhaust is off.
I've seen rooms that swing up/down 10%RH every 5-10min with the venting cycle....technically, this isn't ideal. Even if the RH is within the normal range, the plant is constantly micro-adjusting.
Remember Kids...ideally, we are trying to imitate the outdoors. RH doesn't swing up/down, all around, pick a bail of cotton in the wild out of doors does it?

 

[Guest]

The 'dry' heat in the room drops the RH of the outside air as soon as it enters and will balance out very quickly to a happy medium when it's raining out.

I kind of think the same thing but when I'm exchanging air every 45 seconds sometimes I wonder how much of a factor that is. Part of it for me, I thinkz, is I really recirculate air in the room and it has to fight it's way out. My air is uber homogenized in all corners of the space...easier to do the larger the room is.

I've seen rooms that swing up/down 10%RH every 5-10min with the venting cycle....technically, this isn't ideal.

I'm pretty anal about enviro control, even with an open system, and my temp doesn't vary by more than 2 degrees all cycle and while my humidity will drift some through the light and dark cycles, controlled better at night due to no venting and a dehumidifier, it's very stable. Those swings sound not too good. I think the plants really like stability so they don't constantly have to expend energy to make adjustments.

 

[mrwags]

Hey guys we are not building a rocket here. If you have no way of getting a humidifier simply dump some water on the floor when the lights go out. I will take all night for it to evaporate and will raise the humidity to the desired 60% and above easily or as already stated but a rag in a bowl and let it hang over the side but a digital humidifier is a must to make you happy I feel.



Mr.Wags

 

[avgjoe]

Search my name and check out my post about misters. Fixed it for me and I had conditions very similar to yours.

 

[Guest]

If you have no way of getting a humidifier simply dump some water on the floor when the lights go out.

Sorry but I think that's actually stupid. Of what use is it to raise humidity during lights out? The plants are sleeping. That's a recipe for disaster IMO. I run my dehumidifier lights out and shut the vent fans off meaning I remove moisture during that cycle. Lights on more heat, plants are 'growing' and a little higher humidity is fine. The heat from the lights create an evaporative cooling effect on the buds while they respirate. I picked up a nice 1% accurate infrared thermometer to check bud temps. Interesting stuff for sure.

Search my name and check out my post about misters.

I will but a link would have been nice bro :wink:.

EDIT - OK checked out your posts and that mister thing is nice in situation where you have totally sealed air cooled lights. No way I would spray a bunch of water with oscillating fans running and all unless the hoods were perfectly sealed. Probably a cheaper and more reliable alternative to using a humidifier though.

 

[mrwags]

Sorry but I think that's actually stupid. Of what use is it to raise humidity during lights out? The plants are sleeping. That's a recipe for disaster IMO. I run my dehumidifier lights out and shut the vent fans off meaning I remove moisture during that cycle. Lights on more heat, plants are 'growing' and a little higher humidity is fine. The heat from the lights create an evaporative cooling effect on the buds while they respirate. I picked up a nice 1% accurate infrared thermometer to check bud temps. Interesting stuff for sure.


I will but a link would have been nice bro :wink:.

EDIT - OK checked out your posts and that mister thing is nice in situation where you have totally sealed air cooled lights. No way I would spray a bunch of water with oscillating fans running and all unless the hoods were perfectly sealed. Probably a cheaper and more reliable alternative to using a humidifier though.

Yeah your probably right besides what the hell do I know

Good luck solving your problem.


Mr.Wags

 

[anonymiss12345]

If you have no way of getting a humidifier simply dump some water on the floor when the lights go out.

Maybe you have, but I have NEVER experienced a low humidity problem during lights out.
Having to run a DE-humidifier at that time is the norm.

 

[Woody Creek]

STOP!!! problems before they occur.

STOP!!! problems before they occur.

keep your walls clean with hydrogenperoxide sanitation water. with a splash of ISO for dying. it kills and cleans to prevent. Preventing problems is much better than fixing.

 

[AbbieDoobie]

I run my fan 24/7 and I grow in soil in a cab inside a shed. That place is dry as a bone. I also run a little heater by my intake with a thermostat inside my cab. So, as you can guess, I'm pumping dry heat into my cab a lot of the time to keep temps up. Well, I get humidity at around 30 percent most of the time, except right after I soak the plants, then it rises to about 50. What I do when the humidity is low is spray my plants with Liquid Karma and water. I do this twice a day. This is my fifth grow and I get great results, about an oz. per plant with 9 plants under a 400 hps. So, even thought they say keep humidity at 50, you can still achieve great results with low humidity. Besides, you will want low humidity when it comes flower time, which is the majority of the time of the grow. Best of luck to you.

~Abbie