ventilation

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Smok1ng

New Member
In my opinion Im done with lights and know almost everything I need to start. So Im now at choosing ventilation system. As I been reading best way is to have 3 ventilators. Intake, outtake and one in middle just to rotate the air around. Is PC ventilators okey? Im thinking about 92x92mm and 3600 rpm. I have no idea what means air flow 51cfm. So if you guys could help me with some info on better ventilation and hown to choose them wisely I would be very thankful! :)
 
waterdawg

waterdawg

Well-Known Member
Using one fan for extraction and passive intake is far simpler to do. But yes a fan for air circulation and keeping canopy cool ( if an issue) is still required. You will want to maintain a slight negative pressure in the grow room, box, etc. by having passive intake there is no need to balance two fans. CFM is cubic feet of air per minute that the fan will move, typically this will be much lower after ducting is in place and dependant on restriction in piping if any. If running a carbon filter it will have a rating in CFM that must not be exceeded or odours will prevail. Computer fans do not work well with any ducting attached due to propeller type.
 
sheldonblack

sheldonblack

Active Member
Smok1ng said:
Im thinking about 1x1x1
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depends on where you live, how hot it gets and what lghting you're using. to give you an idea, I live where it goes over 85 F and I used to run a 600w MH with a 440CFM Canfan and it was still getting too hot in my 3.5'X3.5' tent so I had to use an AC. Really depends on ur climate
 
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Smok1ng

New Member
sheldonblack said:
depends on where you live, how hot it gets and what lghting you're using. to give you an idea, I live where it goes over 85 F and I used to run a 600w MH with a 440CFM Canfan and it was still getting too hot in my 3.5'X3.5' tent so I had to use an AC. Really depends on ur climate
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Can it get too cool? Becouse Im living in europe and now its cold outside + my growbox is going to be in basement. Im going to use 400w.
And I heard from one guy that outgoing ventilator would be great if it could be made in top peace. Like chimmey.
 
JonnyAppleSeed420

JonnyAppleSeed420

New Member
Cool is easier to deal then heat. 72-80 is where you should shoot for without Co2. Waterdawg has it correct, save a little cash not buying two inline fans and get rid of those computer fans. Depending on how much air they push those little fans may work inside for air movement. JAS
 
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Smok1ng

New Member
Dannoo93 said:
1fx1fx1f or is this meters
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thats in meters.

Cool is easier to deal then heat. 72-80 is where you should shoot for without Co2. Waterdawg has it correct, save a little cash not buying two inline fans and get rid of those computer fans. Depending on how much air they push those little fans may work inside for air movement. JAS
Click to expand...

72-80 is that a temperture in farenheits? So I use 1 Computer fan for air movement and where its better to look for inline and outline fans? Where is cheaper?
 
S

Smok1ng

New Member
waterdawg said:
Using one fan for extraction and passive intake is far simpler to do. But yes a fan for air circulation and keeping canopy cool ( if an issue) is still required. You will want to maintain a slight negative pressure in the grow room, box, etc. by having passive intake there is no need to balance two fans. CFM is cubic feet of air per minute that the fan will move, typically this will be much lower after ducting is in place and dependant on restriction in piping if any. If running a carbon filter it will have a rating in CFM that must not be exceeded or odours will prevail. Computer fans do not work well with any ducting attached due to propeller type.
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If I get this right, then I should first look for carrbon filter and then for fans?
How about this deal? For this looks legit. and its cheap in my opinion. http://www.amazon.co.uk/Line-Fan-Carbon-Filter-Duct/dp/B00D0NIFTC/ref=sr_1_6?ie=UTF8&qid=1380552728&sr=8-6&keywords=carbon+filter
 
waterdawg

waterdawg

Well-Known Member
Sorry but not much help in picking size of filters. I use a whole house hepa/carbon filter for a 8x8x8 foot shed, still get some odour near the end. it does look ok though. perhaps some one else could help. perhaps google odour control requirements for recommended sizes. yes it will be a huge concern IMO if in urban setting.
 
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