temp issues

[vegasguy911]

so my scrog is all set up and everything is going great im just starting flowering and i only have one problem left my flowering box is to hot....its fine when the door to it is open well not fine but somewhat better but when its closed it gets upwards of 90degrees farenheit.....the plants look good and dont look heat stressed but man i know that isnt a great temp and i cant seem to get it cooler.....??????i have what i think is good ventilation in it but i dunno???i have a air cooled hood with tempered glass and a fan venting it out, an intake and exhaust fan and two fans just keeping air moving around in the box...btw its just a 250w hps so whats my problem...im thinking of getting a stanley blower fan to vent out to up the flow but i cant figure how to hook it up by mounting it to the outside of my box some how, its to bulky to put in the small space inside i have...2footX2footX5foot???k im done rambling help>>>

 

[vegasguy911]

also should i hook it up to the hood for my light or just hook it up so it vents the air out the top of my box...what would cool better.........i was thinking at the top of the box because heat build up?

 

[atmosphere]

Yes put a powerfull fan on top . check out how well fans preform under pressure . Fans like the ones in a PC are not capable of preforming well when there is too much air resistance .

 

[vegasguy911]

so you think it would be better to hook it up to the top of the box instead of the lights air cooled hood? is that what you mean...and im going to be using a stanley blower they sell them at my walmart.

 

[redslayer187]

What is the temp of the room that the box is exhausting into? Your ambient temps might be too high to get it any cooler in the box. My cab is usually 85 with lights on and that means the room that the box is exhausting into is around 75 and I can push it lower with the AC I have in the room.

If you are using computer fans they don't work all that well unless you are just using them to pull air into the cab. The blower will probably be best used to cool your hood like you are planning just make sure the room that surrounds the box is also staying cool.

 

[Guest]

im growing in a 2x2 space with a 400 stanly type blower in the bottom and two exhaust fans in the top of the cab and my temps are never above 80...get the stanly blower for sure...peace

 

[vegasguy911]

damn damn damn???!!!!so i got a friggin stanley blower...and hooked it up to my box via a 6inch hole i made in the uper left portion of the back wall of the cab and some dryer ducting...the temp... different maybe a few degrees......i couldnt hook it to the hood directly because the way my box is it wouldnt have worked, but ive seen many other people do the same way i did so whats my problem????well im not buying any other fans or anything im just gonna make do...i think it is the ambient air in the room that is to hot so my prob should be gone come fall.....

 

[TrustNoOne]

what's the room temp?
if you have an air-cooled hood without a fan connected to it you don't really have an air-cooled hood.

 

[Levitikuz]

try this....take the dry ducting and put in in your AC vent in your room...and then blow that air into your grow cab for your intake.....it works like a charm....thats how i got my stanley set up look..











later

 

[EZB581]

damn damn damn???!!!!so i got a friggin stanley blower...and hooked it up to my box via a 6inch hole i made in the uper left portion of the back wall of the cab and some dryer ducting...the temp... different maybe a few degrees......i couldnt hook it to the hood directly because the way my box is it wouldnt have worked, but ive seen many other people do the same way i did so whats my problem????well im not buying any other fans or anything im just gonna make do...i think it is the ambient air in the room that is to hot so my prob should be gone come fall.....

Vagas, That Stanely should be more than enough to cool your 20sqft area. I assume you have the stanley blowing "into" the cab. Consider placing the fan at the bottom. Blow air in from the bottom & vent the hot air out the top. Much easier for hot air to rise up & out than down & out. You can modify your stanley to "draw" air from the top with a few simple steps.

 

[vegasguy911]

what's the room temp?
if you have an air-cooled hood without a fan connected to it you don't really have an air-cooled hood.

right you are but as i said i have a fan already venting the hood its just not as strong as the stanley and i have the stanley also.....

 

[vegasguy911]

Vagas, That Stanely should be more than enough to cool your 20sqft area. I assume you have the stanley blowing "into" the cab. Consider placing the fan at the bottom. Blow air in from the bottom & vent the hot air out the top. Much easier for hot air to rise up & out than down & out. You can modify your stanley to "draw" air from the top with a few simple steps.

no its venting the hot air out of the cab thats what a buch of people told me to do and i cant hook it to my ac because where i live central air really isnt a thing people have...i just put window unts in for the hot seasons...so i cant add pics so let me describe as best a can...(dont have a camera) i have a 2foot by2foot by 5foot box its air tight via weather stripping and i have a fan

like that venting the hood two other cooling fans bringing air in about 70cfms each , nothing to strong and the stanley is venting air out the upper right back wall of the grow box via dryer ducting and a six inch hole, so it must be the ambient air in the room like you guys said because the room is aobut 78degreesF...until i get the money to run an ac in the room with all this im screwed until the cool season i think wich thank god is right around the corner.

 

[Guest]

i will give my advice on proper ventilation for a cab.....air in the bottom air out the top that simple the blower intake should be on the bottom...exhaust fans on the top.......no cool tube and i run 100 watts per square foot and my cab does never get above 80...

 

[Guest]

no its venting the hot air out of the cab thats what a buch of people told me to do and i cant hook it to my ac because where i live central air really isnt a thing people have

So vegasguy911 dosen't have A/C - in VEGAS? ouch if that is the heat you are dealing with - -

When are your lights on? I run mine at night when it is cooler - it's hot here but not over 100 very often. My plants start showing stress about mid 70's really and it starts getting ugly in the low 80's. Small cabbys that run 80-85 could show some serious benifit by tripleing co2 levels - might be worth researching,,,
A swmp cooler works well here, because the humidity is usually pretty low, but swamp coolers can only drop the temps 15-20 degrees -- if your over 110 offten,,, or have high relitve humidity offten that isn't a option.

 

[TrustNoOne]

right you are but as i said i have a fan already venting the hood its just not as strong as the stanley and i have the stanley also.....

sorry vg, went back and reread all posts and now i get it. was a little confusing when i first read it man.
yeah, i think you have the answer with the room temp. with a 250w and good intake and exhaust it's kinda puzzling why your temps go to 90. i would expect you wouldn't see an increase of temp in the box of more that 5f over the room temp.
the solutions that i would say are going to help are either a/c the room into the low 70's or increasing the intake and outflow of the box. if you can't buy the fans that you knowyou need maybe try cutting larger passive intakes and using both of those duct booster fans to exhaust. it's kind of hard to get creative with fans when a/c is probably the best solution to your heat problems.
we've all had heat issues at one time or another so i feel your pain man. all in all i'd say a/c would be your best bet.

 

[gromer]

Put an ac in the window of the room that the cab is in cool the macro enviroment cool the micro enviroment,see?And just a 411 that is not enuff fan to do anything.Hey i used one to cool a 400 4 ever but I was just fooling myself.Proper air cooling requires 300 cfm per light reguardless of wattage.Then that stanley I spose hooked up right if thats all ya got pulling air out.Less duct the better ducting sux it kills ya.Then about half that fan wise bringing air in.And it should be coming from somwhere cool.You cant expect to blow 80 degree stale room air into a 2x2 box and have it cool it.You literally need to bring the temps outside that cab down below 70 or forget it.This is why alot of peeps girl out and take the summer off.Just gotta deal with it take it as it comes like you said falls a comin next thing ya know youll be worried about temps gettin to low.Ed rosenthal said it best one good window of time to get a real good harvest indoors and thats fall.Cool low humidity ahh If it were fall all year round Id be a happy man!!

 

[vegasguy911]

Put an ac in the window of the room that the cab is in cool the macro enviroment cool the micro enviroment,see?And just a 411 that is not enuff fan to do anything.Hey i used one to cool a 400 4 ever but I was just fooling myself.Proper air cooling requires 300 cfm per light reguardless of wattage.Then that stanley I spose hooked up right if thats all ya got pulling air out.Less duct the better ducting sux it kills ya.Then about half that fan wise bringing air in.And it should be coming from somwhere cool.You cant expect to blow 80 degree stale room air into a 2x2 box and have it cool it.You literally need to bring the temps outside that cab down below 70 or forget it.This is why alot of peeps girl out and take the summer off.Just gotta deal with it take it as it comes like you said falls a comin next thing ya know youll be worried about temps gettin to low.Ed rosenthal said it best one good window of time to get a real good harvest indoors and thats fall.Cool low humidity ahh If it were fall all year round Id be a happy man!!

in a perfect world ....well im puttin an ac in the room thats the problem it has to be the stanley is helping but like u said stale room air is a bitch...it sux cuz the window has to be covered and light tight and icant have sketchy ducting hanging out so i need an ac in ther.

 

[vegasguy911]

So vegasguy911 dosen't have A/C - in VEGAS? ouch if that is the heat you are dealing with - -

When are your lights on? I run mine at night when it is cooler - it's hot here but not over 100 very often. My plants start showing stress about mid 70's really and it starts getting ugly in the low 80's. Small cabbys that run 80-85 could show some serious benifit by tripleing co2 levels - might be worth researching,,,
A swmp cooler works well here, because the humidity is usually pretty low, but swamp coolers can only drop the temps 15-20 degrees -- if your over 110 offten,,, or have high relitve humidity offten that isn't a option.

born and raised in vegas....not livin on that side of the world these days...so u will just have to trust me that where i live about 99percent of people dont have central air....window units and damn they are a waste of money but i gotta do it....well with all this new venting going on im definatly going up to a 400watt next go around...

 

[atmosphere]

i will give my advice on proper ventilation for a cab.....air in the bottom air out the top that simple the blower intake should be on the bottom...exhaust fans on the top.......no cool tube and i run 100 watts per square foot and my cab does never get above 80...

Now this is going to sound strange . but there is a very good way of venting with the incoming air as well as the outgoing air at the top ! incoming air passive outgoing active . In coming air on th eleft side and outgoing as far away from the incoming as possible. The incoming air is cooler and therefor drops down and spreads nicely and doesn't go straight to the exit .

 

[Guest]

well i guess there is more than one way to skin a cat..im just expressing the best way in my humble opinion...peace

Now this is going to sound strange . but there is a very good way of venting with the incoming air as well as the outgoing air at the top ! incoming air passive outgoing active . In coming air on th eleft side and outgoing as far away from the incoming as possible. The incoming air is cooler and therefor drops down and spreads nicely and doesn't go straight to the exit .