Air circulation

I have a 4' by 4' by 8' room with one 400w hps and was wondering do i need an intake and exaust fan or could i make do with just an exaust fan and a simple co2 setup? Noise is a bit of a factor and that is why i am wondering if i can cut it down to one fan. I can open the door to leave in fresh air for about an hour-2hours everyday. Feedback will be greatly appreciated.

One really strong fan could make up for two not-so-strong fans. As log as there's a hole for air to come in. Oh, and, why would you pay for Co2 when you're just pumping it out the walls? Cut your fans off when feeding Co2.

I would cut the fan off when the Co2 is on. That was the original plan but i just assumed ye would know i meant that :/ So you think if i just have somewhere for the air to get in and have one fan in the room that'd work?

My room is 3x6x8 and I have one inline exhuast fan thats 400 cfm, it goes straight to my light and acts as the exhaust and i have no intake fan but i have a hole for one should i decide to ever use one wich is not very likely becouse the inline 400cfm creates enough pressure that it would be a wast of energy, it feels like i have a intake fan from all the pressure being sucked in the room. If you have an air cooled light and C02 thats even better for a setup like this becouse where the intake hole i made is, you could run a hose from ther to the intake of the air cooled light from there to your exhaust witch would be perfect for your Co2 since there would be no airflow but you would need the right Co2 guages to measure your Co2. If you need me to explain this better let me know.
Well i hope this helps answer you Q's
BigBudE

Youll still need to cut a hole in your ceiling for the exhaust for the fan

Ok BidBudE you really clarified that for me, thanks a million. Im trying to get my hands on a Co2 tank and regulator at the mooment so when i get that the chances are im gonna be back asking you for advice if you dont mind? And i dont have to worry about holes in ceilings. XD

I'll help out however i can but i dont have Co2 right now either so i dont know how much help i can be there. I just know that you dont need incoming air if you have Co2. I hear that you can rent a big 50 pounder for around $40-60 a year but you still have to pay to get it filled each time, all in all for Co2 its probally the cheapest way to go for Co2 and the best. With the sugar and yeast method its harder to measure and within 3 months of paying for sugar and yeast youll spend more than what you would have just renting a tank.
Hope this helps
BigBudE

Its not the tank im worried about getting, i can get my hands on that easy enough. Its getting the regulator im having trouble with :/ Know anywhere i can pick one up online?

I would just exhaust the light so you can keep it cool. You can buy a fan controller to turn down the fan when people come over and so on to make the noise go away. And if you dont want smell you can use a fan and scrubber to scrub air clean inside tent and it keeps the air inside as to not mess up c02. HTG supply has co2 regulators as well has hydrofarm as a good one too.

my grow box is almost identical to yours in dimensions, i got a 150 cfm inline fan for the exhaust and cut a square hole 6inx6in opposite from where i had the exhaust fan for the passive intake. moves the air almost 2x a min inside the box and u only have the one fan.

I was just gonna make some of those diy carbon scrubbers from the diy section here. Do ye think a squirrel fan would be enough to cool the light and pull air in through the vent?

Thanks guys, i really appreciate all of yere help. Great to know that there is nice people willing to help someone in need out there

kearners said:

I was just gonna make some of those diy carbon scrubbers from the diy section here. Do ye think a squirrel fan would be enough to cool the light and pull air in through the vent?

Click to expand...

Depending on the size, but yea, a squirrel fan should suffice

aint no thang man

+rep for the help guys. Ill get back to ye and let ye know what i end up doing. Thanks.