How To Change Wooden Grow Box Heat/Humidity

mercygrower

mercygrower

Active Member
So this is my little wooden grow box.

IMG_0139.jpgIMG_0140.jpg

I cant tell ya dimensions off hand, over 2ft tall, about 10inches deep, idk how wide. But anyway.

The inside is lined with white bristol board sealed with clear packing tape, theres a 6' fan mounted in the top corner and I've also drilled about 6 holes on the side wall right behind the fan to let air get in.

My problem seem's to be that it gets very warm. The light seems to give off a fair amount of warmth. When I open the door it seems overly warm/humid.
Any idea how I could adjust this or make this so that the plant does mould / heat be an issue?
 

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Green Troll

Green Troll

Active Member
Buy yourself a cheap digital temp/humidity gauge (i got mine from amazon for about £7) and put it inside the box. Check to see if you are running around 70 degrees and with about 40-60% humidity. I doubt humidity will be an issue if you do the following...

Now your set up has one major flaw. If you have a fan and air holes for intake, where is the air going? You have no out take. Your fan is basically circulating hot air around the box and, quite honestly, you might as well not have it. Try installing a fan that will suck air out of the box, as this will cause negative pressure and draw fresh air in from your inlet holes. Keep the out fan at the top (as heat rises) and the inlet holes near the bottom. Your fan should be circulating the cool, fresh air drawn in from your inlet holes, not the stale hot air the plant doesnt like.

Remember, without CO2 from fresh air, your plant will suffocate and stunt growth. A PC fan will cost as little as £1 and you can run it from an old mobile phone charger.

Good luck and happy growing.
 
mercygrower

mercygrower

Active Member
Green Troll said:
Buy yourself a cheap digital temp/humidity gauge (i got mine from amazon for about £7) and put it inside the box. Check to see if you are running around 70 degrees and with about 40-60% humidity. I doubt humidity will be an issue if you do the following...

Now your set up has one major flaw. If you have a fan and air holes for intake, where is the air going? You have no out take. Your fan is basically circulating hot air around the box and, quite honestly, you might as well not have it. Try installing a fan that will suck air out of the box, as this will cause negative pressure and draw fresh air in from your inlet holes. Keep the out fan at the top (as heat rises) and the inlet holes near the bottom. Your fan should be circulating the cool, fresh air drawn in from your inlet holes, not the stale hot air the plant doesnt like.

Remember, without CO2 from fresh air, your plant will suffocate and stunt growth. A PC fan will cost as little as £1 and you can run it from an old mobile phone charger.

Good luck and happy growing.
Click to expand...
I must say you have backed up everything which I believed was an issue. I'm wondering if I should change the fan setup to blow out through the back instead and drill some more instal holes along the bottom back side. The humidity gauge looks like another 20-30 bucks out of my pocket so thats going to take a week or so lol Im so poor...:/

Hopefully get this thing figured out intime for a flowering chamber!
 
F

F A B

New Member
mercygrower said:
I must say you have backed up everything which I believed was an issue. I'm wondering if I should change the fan setup to blow out through the back instead and drill some more instal holes along the bottom back side. The humidity gauge looks like another 20-30 bucks out of my pocket so thats going to take a week or so lol Im so poor...:/

Hopefully get this thing figured out intime for a flowering chamber!
Click to expand...
what he says is correct exh always at top and intake lowest point and use fan to suck air out and no intake fan and do u have any computer fans those work good just dont snatch the one out of computer u using
good advice green troll

u can get a $3 temp/humidity gauge by accurite at home depot
if not in usa i can send u pic of one im talking about
 
lime73

lime73

Weed Modifier
mercygrower said:
So this is my little wooden grow box.

View attachment 2121344View attachment 2121345

I cant tell ya dimensions off hand, over 2ft tall, about 10inches deep, idk how wide. But anyway.

The inside is lined with white bristol board sealed with clear packing tape, theres a 6' fan mounted in the top corner and I've also drilled about 6 holes on the side wall right behind the fan to let air get in.

My problem seem's to be that it gets very warm. The light seems to give off a fair amount of warmth. When I open the door it seems overly warm/humid.
Any idea how I could adjust this or make this so that the plant does mould / heat be an issue?
Click to expand...
looking good, plant seems to like it in there :)
 
mercygrower

mercygrower

Active Member
lime73 said:
looking good, plant seems to like it in there :)
Click to expand...
I hope the plant likes it, shes going through some rough shit right now, nuted then transfered :/ fml eh. If I get this heat issue figured out, Im going to black out the creases and use it for flower period in May.
 
mercygrower

mercygrower

Active Member
I moved the plant back into the box, added a few quick simple add's. Turned the fan towards the back, drilled a bunch of holes through the back panel, then a bunch of holes on along the bottom for intake.

The heat the light is producing is still making the box quick warm and probably humid. I still think its a ventilation problem.

Happy 4/20 folks, at 4:20 am I will be checking on the box with an update.

Here's some pics of it atm.

IMG_0208.jpgIMG_0210.jpgIMG_0211.jpgIMG_0212.jpg
 
B

bigbubba227

Active Member
u need to mount a small PC fan right to them holes at the top blowing out. with all the intake holes u have at the bottom im sure with a PC fan u will get enough air moving out the box to fix ur overheating problem. go to ur local walmart they sell PC fans. for around 5 bucks.
 
Green Troll

Green Troll

Active Member
I recently ordered 10 x 120mm PC fans at £1.70 each (less than $3) for my up and coming set up. PC fans are definitely widely used for this application so it is safe to say they are tried and tested. What i would suggest though is one large hole for your out. Your intake holes look just fine. But you dont want any resistance from the out fan. Make sure it has the freedom to blow out the box at its full capacity. You can always put a little bit of ducting on the outside of the hole if you are worried about light bleeding into the box.
 
F

F A B

New Member
Green Troll said:
I recently ordered 10 x 120mm PC fans at £1.70 each (less than $3) for my up and coming set up. PC fans are definitely widely used for this application so it is safe to say they are tried and tested. What i would suggest though is one large hole for your out. Your intake holes look just fine. But you dont want any resistance from the out fan. Make sure it has the freedom to blow out the box at its full capacity. You can always put a little bit of ducting on the outside of the hole if you are worried about light bleeding into the box.
Click to expand...
what i used one time was a microwave tv dinner that has a 2 inch deep try and was black
it was rectangular shape so i cut in half and taped half over each hole worked great and free with purchase of a meal
a win win
 
mercygrower

mercygrower

Active Member
Going to be removing the white fan, putting the pc fan where the holes for exhaust were and I may add another 2 light bulbs. Ill post some pics tomorrow whenever I get it finished.

Progress as far as the plant, check my journal! :D
 
mercygrower

mercygrower

Active Member
Here we are, mounted and running. I did it a little different though....

So I scrapped the white fan (3rd fan I bought for this project :wall:) cut out the section where all the holes were then fitted the fan and screwed it on the back where the holes were. Taped up the crease's so the fan actually works, and also tapped up the holes on the side and top.

Hope it works!

IMG_0224.jpgIMG_0222.jpgIMG_0223.jpg

And heres just a picture of my favourite seven leaves and my little guy as of today.
IMG_0225.jpgIMG_0226.jpg
 
W

wood3501

Member
Green Troll said:
Buy yourself a cheap digital temp/humidity gauge (i got mine from amazon for about £7) and put it inside the box. Check to see if you are running around 70 degrees and with about 40-60% humidity. I doubt humidity will be an issue if you do the following...

Now your set up has one major flaw. If you have a fan and air holes for intake, where is the air going? You have no out take. Your fan is basically circulating hot air around the box and, quite honestly, you might as well not have it. Try installing a fan that will suck air out of the box, as this will cause negative pressure and draw fresh air in from your inlet holes. Keep the out fan at the top (as heat rises) and the inlet holes near the bottom. Your fan should be circulating the cool, fresh air drawn in from your inlet holes, not the stale hot air the plant doesnt like.

Remember, without CO2 from fresh air, your plant will suffocate and stunt growth. A PC fan will cost as little as £1 and you can run it from an old mobile phone charger.

Good luck and happy growing.
Click to expand...
just a quick question, it's a stup ididea to suck fresh air into the closet?instead of sucking it out of the closet?
and, if not.why not?:)​
 
mercygrower

mercygrower

Active Member
wood3501 said:
just a quick question, it's a stup ididea to suck fresh air into the closet?instead of sucking it out of the closet?
and, if not.why not?:)​
Click to expand...
Nah not a stupid question. I know you werent asking me but your better to have an exhaust fan over the intake fan, more less because you want to get rid of the co2. If you have an intake fan it will blow all the warm air around. Unless you have 2 fans and both going.

When I first had my setup in my closet I had a simply 8' fan from walmart hanging about my plant and blowing air around it. The door was always slightly open so it always had fresh air coming in/out but youd be better off with an exhaust, but make sure you have a way for air to get in.

Good luck!
 
F

F A B

New Member
mercygrower said:
Nah not a stupid question. I know you werent asking me but your better to have an exhaust fan over the intake fan, more less because you want to get rid of the co2. If you have an intake fan it will blow all the warm air around. Unless you have 2 fans and both going.

When I first had my setup in my closet I had a simply 8' fan from walmart hanging about my plant and blowing air around it. The door was always slightly open so it always had fresh air coming in/out but youd be better off with an exhaust, but make sure you have a way for air to get it.

Good luck!
Click to expand...

best setup is no fan pulling air in and just a fan on exh it will create neg pressure and suck air into intake hole and through grow
 
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