Ventilation please help

[bigbacon2]

Ok so i am putting my order for my new grow room in tomorrow with HTG. The question i have is regarding intake and exhaust fans and the cfm formula. I understand the formula and was just watchin Jorge Cervantes grow dvd and he said you want the air to circulate the room at least once every five minutes. So my question is will a 6inch inline fan with a cfm of 424 be big enough for my grow room. THe room is 10x10 with 7 foot ceilings so i have 700 cubic feet. I will be running 2 1000 watt hps air coolable lights and a carbon filter all exhausting through the fan. And will a 4 inch inline fan with a cfm of 170 be efficient enough for my room.
Thanks for the help.

 

[GypsyBush]

I am not going to tell you what to do... go with what you know..

But I will describe my ventilation setup...

tent is 36"x20"x60"

Cool tubed 600 watt HPS with dedicated 4" 170 CFM fan blowing straight through the tent... no mixing with tent air...

6" 440 CFM exhaust connected to a cooling thermostat...

6" 440 CFM intake also connected to the thermostat, but speed controlled to about 330 CFM...

and this is my ventilation system for a 5 square foot area...

hope this helps...

and yes, I am aware that I am over lighting and over ventilating, but I like that... I really like that... lol....

Best of luck...

 

[bigbacon2]

thanks for the input. I have not put a grow room together in 6 years at least and was wondering if what i stated abouve is big enough fans for what i am doing before i order them?

 

[7th1der]

I am not going to tell you what to do... go with what you know..

But I will describe my ventilation setup...

tent is 36"x20"x60"

Cool tubed 600 watt HPS with dedicated 4" 170 CFM fan blowing straight through the tent... no mixing with tent air...

6" 440 CFM exhaust connected to a cooling thermostat...

6" 440 CFM intake also connected to the thermostat, but speed controlled to about 330 CFM...

and this is my ventilation system for a 5 square foot area...

hope this helps...

and yes, I am aware that I am over lighting and over ventilating, but I like that... I really like that... lol....

Best of luck...

I see you have a 170 CFM fan cooling your 600 watt cool tube. Is my little 30 something CFM muffin fan not enough to cool my 400w HPS Cooltube? I just need to push the hot air forward.

 

[flamdrags420]

the fan in question theoretically will remove the mass of air based on your volume of 700 ft^3 every 1 minute and 39 seconds. I believe from the faqs on here that your intake shold be 70-80% of the exhaust. This would mean that your intake should be about 303CFM - 339CFM. Based on this you would need more intake fans or a larger one.

 

[GypsyBush]

I see you have a 170 CFM fan cooling your 600 watt cool tube. Is my little 30 something CFM muffin fan not enough to cool my 400w HPS Cooltube? I just need to push the hot air forward.

Only installing it and seeing the results will tell you...

Al B. Fuct used to run 2x colltubed 1000s with a 200 CFM fan... So I do have a bit of overkill... but I designed my vent sys to run 2 tents...

the fan in question theoretically will remove the mass of air based on your volume of 700 ft^3 every 1 minute and 39 seconds. I believe from the faqs on here that your intake shold be 70-80% of the exhaust. This would mean that your intake should be about 303CFM - 339CFM. Based on this you would need more intake fans or a larger one.

A good, unrestricted passive intake will suffice most applications...

Intake fans may actually reduce room efficiency... by making the exhaust fan work with a restriction... thus reducing it's service life...

I use one to bring outside air from far away...

But passive intakes are highly acceptable 90% of the time...

Just a thought...