Losing battle with humidity - lung room/tent issue

[TimewasterOG]

I’ve been fighting with my climate since setting up the shed and feel like I need some advice. Have 3 tents in a 9x18 shed, split in 2 rooms. All 3 tents in one room with veg and 1 flower tent venting to outside with a 4” in-line; and bigger 5x5 flower tent venting into smaller room (used for potting and drying) with a 6” ac infinity. My issue is with the 5x5 flower tent. Main room usually sits around 50%rh (sometimes need dehuey going to keep it there) but even with negative pressure, the 5x5 tent reads as high as 20% points higher than the room it’s pulling from. Even when I have 2 6” ducts sitting right in front of the dehuey exhaust pulling into the tent, it’s still sitting way higher than the room it’s in.
I see a couple possible reasons
1) too crowded? They’re just putting out that much through transpiration? I do need to do some defoliation
2) wondering if the ac infinity sensor is accurate- I have noticed it reads a good 5-10% points above other hygrometers placed right next to it. Anyone else noticed this with the ac infinity controller?
3) Do I need more intake? Are the 2x 6” holes not enough, which the sides sucking in do seem to indicate…will try feeding another 6” through one of the upper holes and/or opening the lower flap.

I’m open to other ideas!
I’ve had to resort to blowing the dehuey right into the door of the tent to even get it down to the 60% range.
thanks in advance!

 

[crimsonecho]

my room which the tent sits in is 40% but my tent is always a little over 50%. so if you want to really get it down get a bigger dehum and lower the room rh.

i dont see any other solution and thats why i bought the biggest domestic dehum i could find. and even with that its 50 in the tent.

in your case you need a monster dehum like industrial dehums they use in construction sites to dry concrete and shit. you’d never have humidity problems with those imo.

 

[insanehippie]

AC infinity will tell you that that’s not enough CFM for that tent you have to account for the heat of the light even if you have 90 degree turn in your exhaust ducting that’s has to be accounted for they have all the formulas on the website to figure this out…but I use a 6inch in a 3*3*8 and it’s not enough with my lights and ducting…ac infinity told me I need more cfm…so I got booster fam it fits on the end of your ducting and adds cfm l…it still feels like it’s not enough it does better in the other 3x3x6 (it’s shorter so it requires less cfm to exhaust efficiently

They have live agents on there website

Open rooms grows are a lot easy you gotta think it’s a small in closed space so heat and humidity gets trapped…you need to be able to exhaust that…so I’m assuming your tent walls are already sucking in from negative pressure so you need to get these bars OR make some out of pvc and it stop the walls for caving in from adding even more cfm

 

[insanehippie]

The intakes holes whether it be another fan pushing air in or your air vents on the bottom of the tent need to be big enough allow air flow as well

 

[insanehippie]

What’s the dimensions or the 5x5 you have ?

 

[insanehippie]

my room which the tent sits in is 40% but my tent is always a little over 50%. so if you want to really get it down get a bigger dehum and lower the room rh.

i dont see any other solution and thats why i bought the biggest domestic dehum i could find. and even with that its 50 in the tent.

in your case you need a monster dehum like industrial dehums they use in construction sites to dry concrete and shit. you’d never have humidity problems with those imo.

This will help @TimewasterOG your lung room needs to super dry like 35 or as low as possible

 

[TimewasterOG]

my room which the tent sits in is 40% but my tent is always a little over 50%. so if you want to really get it down get a bigger dehum and lower the room rh.

i dont see any other solution and thats why i bought the biggest domestic dehum i could find. and even with that its 50 in the tent.

in your case you need a monster dehum like industrial dehums they use in construction sites to dry concrete and shit. you’d never have humidity problems with those imo.

Oh man, I have drooled over the quest units more than once….just don’t have pockets that deep right now, any my wife would kill me! I think I’ll have to invest in a mini split for overall climate control before the industrial dehuey. It’d probably save in the long run, but that’s the problem with being broke - it’s more expensive.
I do have a larger, older one but it runs a little hot. Might drag it in there anyway and see.

 

[TimewasterOG]

AC infinity will tell you that that’s not enough CFM for that tent you have to account for the heat of the light even if you have 90 degree turn in your exhaust ducting that’s has to be accounted for they have all the formulas on the website to figure this out…but I use a 6inch in a 3*3*8 and it’s not enough with my lights and ducting…ac infinity told me I need more cfm…so I got booster fam it fits on the end of your ducting and adds cfm l…it still feels like it’s not enough it does better in the other 3x3x6 (it’s shorter so it requires less cfm to exhaust efficiently

They have live agents on there website

Open rooms grows are a lot easy you gotta think it’s a small in closed space so heat and humidity gets trapped…you need to be able to exhaust that…so I’m assuming your tent walls are already sucking in from negative pressure so you need to get these bars OR make some out of pvc and it stop the walls for caving in from adding even more cfm

Damn, seems like an 8” would turn the whole fucking tent inside out! I did increase the intake which helped with the caving in significantly and helped lower the rh a bit. I did pair an 8” carbon filter with the t6 so would have the option of going bigger eventually if needed.
And I have totally been thinking about just opening the damn tent door, see what that does - would be hard to just go open room with the veg tent in the same space.

 

[TimewasterOG]

This will help @TimewasterOG your lung room needs to super dry like 35 or as low as possible

the tent is a 5x5x6’6” (might be 7’, can’t remember) also infinity, so in the 150-175cft range. So yeah, I guess I’m not quite hitting the 2x cfm per Cubic ft to account for filter and the 2 x 90° bends in the ducting. But again, with the obvious negative pressure it sure seems like it has to be adequate.

 

[TimewasterOG]

Update: I was foolish and did not have near enough intake with just the 2 x 6” ducts into the lower holes. I’ve increased that and it seems to have helped a bit.
Failed to mention a good part of the issue is outside has been sitting at about 100% rh for the last almost week - my gear is just having a hard time fighting that.

 

[Kerowacked]

You don’t mention temps but a small electric heater will dry that tent air quickly.

 

[TimewasterOG]

You don’t mention temps but a small electric heater will dry that tent air quickly.

I’m in Atlantic Canada, so while it’s a bizarrely warm winter I do have a slim panel type heater that runs pretty regularly (more than I’d like given the power bill), which does help some, but doesn’t quite deal with the 100% outside ambient rh. So temps are usually 16-17°/around 50% rh in the room during my day (flower tent’s night time) and up to 5° warmer with lights on (tent heats up a bit more than that).
It would likely help a bit to bump the temp a couple degrees, but again it’s a balancing act with the power bill.
Looking like the weather is finally going to dry out some so that will probably deal with my issues until the next week of 100% humidity

 

[Kerowacked]

I’m in Atlantic Canada, so while it’s a bizarrely warm winter I do have a slim panel type heater that runs pretty regularly (more than I’d like given the power bill), which does help some, but doesn’t quite deal with the 100% outside ambient rh. So temps are usually 16-17°/around 50% rh in the room during my day (flower tent’s night time) and up to 5° warmer with lights on (tent heats up a bit more than that).
It would likely help a bit to bump the temp a couple degrees, but again it’s a balancing act with the power bill.
Looking like the weather is finally going to dry out some so that will probably deal with my issues until the next week of 100% humidity

I have the opposite problem, little ceramic heater on the 750w setting keeps the temp around 80F but drops the humidity below 40 without a humidifier running full.

 

[thumper60]

Oh man, I have drooled over the quest units more than once….just don’t have pockets that deep right now, any my wife would kill me! I think I’ll have to invest in a mini split for overall climate control before the industrial dehuey. It’d probably save in the long run, but that’s the problem with being broke - it’s more expensive.
I do have a larger, older one but it runs a little hot. Might drag it in there anyway and see.

Any 50 pint or larger will blow lots of heat you dont need a 2000 dollar dehuy craigs list or marketplace dime a dozen

 

[TimewasterOG]

I have the opposite problem, little ceramic heater on the 750w setting keeps the temp around 80F but drops the humidity below 40 without a humidifier running full.

It’s always a dance! At least a humidifier is cheaper to run than a dehumidifier!

 

[TimewasterOG]

Any 50 pint or larger will blow lots of heat you dont need a 2000 dollar dehuy craigs list or marketplace dime a dozen
[/QUOTE]

I do have that older larger one mentioned - I’ll try dragging it in there tonight and see if it keeps
up better

 

[Kerowacked]

It’s always a dance! At least a humidifier is cheaper to run than a dehumidifier!

Yeah, but a dehum compressor costs more to run than that lil ceramic heater on low (i think)

 

[insanehippie]

obvious negative pressure it sure seems like it has to be adequate.

but it’s not

I believea a 8in would be good but the cheaper route would been to add a couple boosters at your 90 degrees turns

maybe try to reduce the light the plants will transpire less plus less heat to exhaust

yea may lose on yield but ime it can improve quality

 

[insanehippie]

Damn, seems like an 8” would turn the whole fucking tent inside out! I did increase the intake which helped with the caving in significantly and helped lower the rh a bit. I did pair an 8” carbon filter with the t6 so would have the option of going bigger eventually if needed.
And I have totally been thinking about just opening the damn tent door, see what that does - would be hard to just go open room with the veg tent in the same space.

You have to have so many cfm per carbon filter, silencer so many feet of ducting etc etc …that 6 inch isn’t sufficient for a 8 inch….the carbon filter and other accessories adds a lot to the cfm needed to exhaust the tent

but right idea for planning to expand in the futre

it wouldn’t be hard at all man make sure you have no light leaks…it’s easy to get spikes in a tent vs room more stable and controlled imo

 

[TimewasterOG]

Yeah, but a dehum compressor costs more to run than that lil ceramic heater on low (i think)

I would think you’re correct. The older 50pt (just checked last night) pulls 5.5 amps - very much doubt your little heater pulls that much