Grow Tent Temperature seems high .. Help!

virulient

virulient

Active Member
You don't need anything more than a 4 inch duct booster to pull hot air out of the tent, and a PASSIVE INTAKE near the bottom to bring in fresh air. Add the small, oscillating fan(s) inside and you're good to go.

Also, I am assume you don't live in a house where its 80 degrees+ all the time! That would unbear-able imo!! Don't let these guys talk you into an expensive ventilation system that would work for a 600w HPS bulb. You are using LEDs in a small environment. You don't need much, don't waste your cash!!
 
FootClan

FootClan

Well-Known Member
get the booster fan then not trying to have anyone waste money i just think maybe he might want to upgrade to a Bigger grow sometime down the road ....if he plans to never upgrade to somethng bigger then yes just get the booster fan it will be fine for LEDS....... but still gotta like that 70 dollar inline fan thats a pretty good deal only 30 more then the booster fan and id hardly condisder that "fancy"
 
Dan Kone

Dan Kone

Well-Known Member
FootClan said:
get the booster fan then not trying to have anyone waste money i just think maybe he might want to upgrade to a Bigger grow sometime down the road ...
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If that's the case, then a good 4" inline makes sense.

but still gotta like that 70 dollar inline fan thats a pretty good deal only 30 more then the booster fan and id hardly condisder that "fancy"
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If he doesn't plan on upgrading, then a more expensive fan is nothing but a waste of money. No real significant benefit. It's buying a fararri and driving in the slow lane.
 
FootClan

FootClan

Well-Known Member
Dan Kone said:
If that's the case, then a good 4" inline makes sense.



If he doesn't plan on upgrading, then a more expensive fan is nothing but a waste of money. No real significant benefit. It's buying a fararri and driving in the slow lane.
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not really 30 more bucks isnt a good comparsion to buying a fararri...... we are talking 30 bucks thats like the defference between A/c and no A/c in a car not a Commuter to a fararri.....If i was telling him to buy the best ventaltion system money could buy then it would be like geting a fararri and driving in the slow lane but a 4" fan is not like getting a fararri and driving in the slow lane on that i can not agree at all....... Like i said a 70 dollar 4" fan is BASIC bare bones growing here not anything Fancy deff. not a waste of money and its deff not like getting a fararri and driving in slow lane.......... Ill show you what a fararri would look like in grow terms....heres my proccessor control panel if i told him to get this then it would be like a fararri in slow lane......
 

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chasmtz

Active Member
Dan Kone said:
My arguement for just getting the cheap booster fan.

CFM calculator:

http://cheaphydroponics.com/Merchant2/cfmcalc.htm

Results for a room 5x2x2:



That booster fan is rated at 188 CFMs. I own said fan, while I question the 188 CFM rating (I suspect it's closer to 80-100 CFM's since a 4" vortex is way more powerful), I have no doubt that it's way more than enough to exchange the air in that room every minute or two. I'd argue that a 4" vortex or can fan is WAAAY overkill. 4" vortex is what I use to in my 4x4x7 Mom tent and it's plenty powerful enough for that.

All he really needs is a simple fan to exchange the air. No reason to buy some thing unnecessarily fancy. All he'll get is a diminishing return. It's throwing money down the toilet.
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The problem with the booster fan is that it will do almost nothing if there is any amount of ducting. these only work to boost passive intakes or help long exhaust runs.
http://www.growwurks.com/valuline-centrifugal-inline-blower-6-435-cfm.aspx- 6' fan, 435 cfm, 80 bucks
 
Dan Kone

Dan Kone

Well-Known Member
FootClan said:
not really 30 more bucks isnt a good comparsion to buying a fararri...... we are talking 30 bucks thats like the defference between A/c and no A/c in a car not a Commuter to a fararri.....
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No, it's not. Because AC gives you a benefit. You get something for your money. This is spending more money for no benefit.

Why is it important to recirculate the air every 15 seconds instead of every minute? He'd get a greater benefit spending $30 on a new bowl for his bong so he could enjoy the smoke more.

Like i said a 70 dollar 4" fan is BASIC bare bones growing here not anything Fancy deff. not a waste of money and its deff not like getting a fararri and driving in slow lane..........
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It's wasting money if he gets no additional benefit from spending the extra $30. What is the additional benefit he receives? Will the buds be stronger? Yield more? No.

Don't like the farrari comparison? Fine. Then it's like putting 20" rims on a ford fiesta.
 
Dan Kone

Dan Kone

Well-Known Member
chasmtz said:
The problem with the booster fan is that it will do almost nothing if there is any amount of ducting. these only work to boost passive intakes or help long exhaust runs.
http://www.growwurks.com/valuline-centrifugal-inline-blower-6-435-cfm.aspx- 6' fan, 435 cfm, 80 bucks
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It's a fan. It sucks the air out of the tent. The fan won't go on strike and refuse to operate because it's called a "booster fan" and not an inline fan. It's a fan. It blows air. It works. This is a very small area. He needs 20 CFM to exchange the air every minute. I own this exact fan and I promise you it's more than 20 CFM. There is no additional benefit I know of when you exchange the air in a room faster than every minute.

If he's planning on getting a new tent in the future and using this fan on it, then I agree, get a nice inline fan. If not, what's the point?

So many people insist on buying equipment they don't need. I don't get it....
 
Dan Kone

Dan Kone

Well-Known Member
Also what people aren't telling him when they are telling him to buy this inline fan is that in addition to the extra $30 he'd spend to buy the nicer fan for no reason, he's also going to have to spend $25 bucks at the hydro store on ducting to attach this fan. The booster fan you can rig to stick right in a tent vent. So now we're talking about spending an extra $55 dollars, $125 total and getting no additional benefit over the $40 fan.
 
FootClan

FootClan

Well-Known Member
Dan Kone said:
Also what people aren't telling him when they are telling him to buy this inline fan is that in addition to the extra $30 he'd spend to buy the nicer fan for no reason, he's also going to have to spend $25 bucks at the hydro store on ducting to attach this fan. The booster fan you can rig to stick right in a tent vent. So now we're talking about spending an extra $55 dollars, $125 total and getting no additional benefit over the $40 fan.
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guess just agree to disagree i dont think it would be a waste of money to have a good exhaust fan.... escpecialy if its only 30 bucks more then the crappy one...... but thats how i role in life if something is twice as good for very little extra im always goin to get the better product if its the same price or close in price and 30 bucks to me is pretty close in price where id get the good shit....... I get that you dont want to waste money on something he dosent need but to me every grower should have a proper exhaust set up unless you running a closed loop.....Like i said in the first post if his grow is hanging in the balance over 30 bucks he dosent really have the money to be doing a grow in the first place...
 
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chasmtz

Active Member
Dan you must be high as hell if you think something that "will work" is as good as something that "would be best." Lowering temps and increasing fresh air flow during flowering will increase yields. I suggest the original poster take all of this with a grain of salt and make his decisions based on what feels right.
 
FootClan

FootClan

Well-Known Member
chasmtz said:
Dan you must be high as hell if you think something that "will work" is as good as something that "would be best." Lowering temps and increasing fresh air flow during flowering will increase yields. I suggest the original poster take all of this with a grain of salt and make his decisions based on what feels right.
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+Rep for logic
 
Dan Kone

Dan Kone

Well-Known Member
chasmtz said:
Dan you must be high as hell if you think something that "will work" is as good as something that "would be best." Lowering temps and increasing fresh air flow during flowering will increase yields.
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The booster fan will evacuate the air more than once a minute. That will accomplish lowering the air temperature and bringing in fresh air just fine.

Do you really believe there is a significant benefit to replace the air once ever 15 seconds instead of every 45 seconds?

I suggest the original poster take all of this with a grain of salt and make his decisions based on what feels right.
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I would suggest the original poster not do what feels right, but look at what he's trying to accomplish, do the math, and buy the product that does what he needs it to do.
 
FootClan

FootClan

Well-Known Member
its logical to get what best rather then getting whats not if the price is close......thats logic to me
 
Dan Kone

Dan Kone

Well-Known Member
FootClan said:
its logical to get what best rather then getting whats not if the price is close......thats logic to me
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It's spending extra money pointlessly. The cheap fan does exactly what he needs it to do just like the more expensive one. The cheap one is probably 3x more powerful than he needs. Getting a fan 20x more powerful than he needs won't yield him 20 times more. And you're claiming that fan is only $30 more, but you're ignoring the fact that he'll have to buy ducting for it as well which is another $25. The booster fan you can shove right into the duct.

Growing can be a real money pit if you always buy more than you need. I just don't want to see people fall into that trap.
 
agesbuds

agesbuds

Member
I use an inline fan for fresh air and another for exhaust. My poor plants were starving for fresh air till I did that. Now they grow about 3'' a week VS an inch in three weeks without fresh air coming in and out. And yea for some reason tents tend to raise the temp rather easy but 68 to 80 will be fine as long as it doesnt stay that temp all day long.
 
manny9868

manny9868

Member
quick fix,
some physics first, : cold airs goes down, hot air goes up..... with this said,
I was havin the same problem....but my temp was shooting 97+,
solution
at the bottom of the tent there is a vent hole, I used a computer fan from rat_shack ($17.00)( it fitted perfectly and snugly into a 4" diameter hole ) i powered it with an old 12dc volt power supply I had laying around (old modem per supply) it started sucking fresh cool air in and the exhaust, i used a hm dpt extractor......that fixed the stupid high temps.........HOPE THIS HELP
 
Weed4Life

Weed4Life

Active Member
My friend have similar issues. his problem is that the room the grow room is in, its hot in there. it was converted from to a living space and now is storage. Its in the back of the house. Stealth is his problem otherwise he could open the windows and exhaust hot air out and bring in more cool air. his room is 5x7x8. he has have a 4" inline fan pulling the heat out. he just installed an ac, but the outer room gets too hot. his temp with ac on is 84-88. without ac, 90-95 depending on the day. IS there a way for him to keep his stealthiness and open the windows and some how filter the air going out? He also has a 8" inline fan and carbon filter in the converted room to absorb what smell comes out of my box. healso use a 4" carbon filter inside the grow room.
 
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