Need fast help with fan setup

N

numb3r

New Member
Hello! I am currently saving money for my grow tent,but I need some help.
So, I am planning on buying a 80x80x160cm mammoth grow tent and using a 250w HPS,of course I need a carbon filter and everything else,but I don't understand some things.
I am thinking of buying a CARBON FILTER 10CM (175M3/H),IN-LINE EXTRACTOR FAN BLAUBERG TUBO-10CM 137M³/H and 10cm ducting.
But what I don't understand, is that the carbon filter is 175M3/H but the fan is 137M³/H will it still work?
I know that the exhaust fan will draw air out of the grow tent and that I need something to bring fresh air into the room too,so can I buy 2 of those fans and use 1 with the carbon filter and one for air intake,and if so ,how do I setup the intake fan??
Also I will be venting the hot air in the same room that my grow tent is going to be in,is heat or fresh air going to be a problem??
Help is greatly appreaciated and sorry for any grammar mistakes.
 
purplehays1

purplehays1

Well-Known Member
numb3r said:
Hello! I am currently saving money for my grow tent,but I need some help.
So, I am planning on buying a 80x80x160cm mammoth grow tent and using a 250w HPS,of course I need a carbon filter and everything else,but I don't understand some things.
I am thinking of buying a CARBON FILTER 10CM (175M3/H),IN-LINE EXTRACTOR FAN BLAUBERG TUBO-10CM 137M³/H and 10cm ducting.
But what I don't understand, is that the carbon filter is 175M3/H but the fan is 137M³/H will it still work?
I know that the exhaust fan will draw air out of the grow tent and that I need something to bring fresh air into the room too,so can I buy 2 of those fans and use 1 with the carbon filter and one for air intake,and if so ,how do I setup the intake fan??
Also I will be venting the hot air in the same room that my grow tent is going to be in,is heat or fresh air going to be a problem??
Help is greatly appreaciated and sorry for any grammar mistakes.
Click to expand...
You want the filter to have a higher m/h so that it doesnt bog down the fan, that setup should work fine. A 250w will put off some heat and if u are exchanging that heat into your room it will heat up the room depending on how large it is. I dont foresee a 250w that is being properly ventilated causing much of a heat issue inside the tent even if it does raise the ambient of your room. As vertical said run lights at night cuz its cooler and energy is cheaper.
 
N

numb3r

New Member
purplehays1 said:
You want the filter to have a higher m/h so that it doesnt bog down the fan, that setup should work fine. A 250w will put off some heat and if u are exchanging that heat into your room it will heat up the room depending on how large it is. I dont foresee a 250w that is being properly ventilated causing much of a heat issue inside the tent even if it does raise the ambient of your room. As vertical said run lights at night cuz its cooler and energy is cheaper.
Click to expand...
Thanks for your help! But what should I do with the intake fan? Buy 2 of those,and use 1 as an intake? And if so,how should I do it?? Sorry,I don't know shit about grow tent setups :S,and thanks again for your help!
 
purplehays1

purplehays1

Well-Known Member
My tent has one fan, just an exhaust fan. It literally sucks all the air from the tent through the light and out. Passive air intakes at bottom of the tent, exhast at top. This both cools the light and provides fresh air to replace the hot air.
 
N

numb3r

New Member
purplehays1 said:
My tent has one fan, just an exhaust fan. It literally sucks all the air from the tent through the light and out. Passive air intakes at bottom of the tent, exhast at top. This both cools the light and provides fresh air to replace the hot air.
Click to expand...
Are you also running a 250w hps? If I could use just the exhaust fan that would be perfect, because I am having problems with money,Passive air intakes=just holes in the tent that you leave open??
Why I thought that I need an intake fan, is because I read, that there won't be enough air for the plants,because all the air is being pulled out and no fresh air is not being brought in.
And also ,if passive air intake=just the hole in the tent,then it seems like my tent only has 2 holes,1 in the bottom and 1 in the top, so would just 1 passive air intake be enough for the plants to be breathing in fresh air??
 
purplehays1

purplehays1

Well-Known Member
im not good with the whole metric system shit, but i think your fan will be plenty strong alone, wont need an intake fan to cool a 250w
 
N

numb3r

New Member
purplehays1 said:
im not good with the whole metric system shit, but i think your fan will be plenty strong alone, wont need an intake fan to cool a 250w
Click to expand...
Sorry if I am bothering you too much,but I just want to get it overwith,So passive air intake-hole at the bottom of the tent? And if so,wouldn't the smell leak from that hole?
 
purplehays1

purplehays1

Well-Known Member
numb3r said:
Are you also running a 250w hps? If I could use just the exhaust fan that would be perfect, because I am having problems with money,Passive air intakes=just holes in the tent that you leave open??
Why I thought that I need an intake fan, is because I read, that there won't be enough air for the plants,because all the air is being pulled out and no fresh air is not being brought in.
And also ,if passive air intake=just the hole in the tent,then it seems like my tent only has 2 holes,1 in the bottom and 1 in the top, so would just 1 passive air intake be enough for the plants to be breathing in fresh air??
Click to expand...
I run a 400w hps

passive air intake is just an open hole

You can easily test this just hook your fan up to the top whole and turn it on and see if it sucks the walls of the tent in really hard. SOme negative pressure (sucking in) is good cuz it makes sure all your exhaust is going through your carbon filter, but you dont want it to be a windstorm inside the tent. A fast exhaust fan like i think u have will move way more fresh air through the tent than the plants need, its all about not creating too much wind/pressure that will disturb the plants.
 
purplehays1

purplehays1

Well-Known Member
numb3r said:
Sorry if I am bothering you too much,but I just want to get it overwith,So passive air intake-hole at the bottom of the tent? And if so,wouldn't the smell leak from that hole?
Click to expand...
since u have negative pressure in the tent from the fan, all the air is being sucked through the hole, none will go the reverse direction and escape.
 
purplehays1

purplehays1

Well-Known Member
u may need to get a fan speed adjuster and turn your fan down actually, i did the math and thats a super powerful fan.
 
N

numb3r

New Member
purplehays1 said:
u may need to get a fan speed adjuster and turn your fan down actually, i did the math and thats a super powerful fan.
Click to expand...
It doesn't seem like it's that powerful :/ I read that carbon filters reduce the m3/h or whatever for like 25%-50% so you need a pretty powerful fan to filter all the air out,but I can also get a 110m3/h fan for cheaper,so do you think I should buy the 110m3/h one??
 
N

numb3r

New Member
purplehays1 said:
u may need to get a fan speed adjuster and turn your fan down actually, i did the math and thats a super powerful fan.
Click to expand...
I also found this in the grow tents descripton:

Our suggestion for the extractor fans are below:

Extraction one: 90-180 mc/h

Input one: 50-150 mc/h
 
purplehays1

purplehays1

Well-Known Member
ya my tent has 2 holes for passive intake so u may need a second fan since yours only has one, but i would test it first, u really shouldnt have much difficulty cooling a 250, it should be fine with passive.
 
N

numb3r

New Member
purplehays1 said:
ya my tent has 2 holes for passive intake so u may need a second fan since yours only has one, but i would test it first, u really shouldnt have much difficulty cooling a 250, it should be fine with passive.
Click to expand...
Thanks for all the help! You really explained alot and I learned many new things,so happy that there are people that are willing to help. :)
 
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