Passive Intake + exhaust... will this work

Ok so I have made some quick diagrams on Paint to show you guys how i am looking to vent my rooms, and i am wondering what would be better?
The first one shows 3 fans 1 in veg for exhaust with a passive intake and 2 in the flower, one to cool the reflector and the other for circulation.

The second image shows only 2 fans and I have one in veg for the same as i explained above and one in flower to cool the light and to circulate also running through a carbon filter. The fans are 500cfm centif. inline fans, the rooms are 4x4x7. I would make a passive intake with light trap at the bottom about .5 bigger than the fan in radius for intake. I have the c/f resting on the top of my rooms and connected to the turbine with ducting. Should the c/f be in my flower room or will it be effective as long as all the exhaust is pushed through it b4 the turbine?

questions are:
will the diagrams below work/make sense. Is it necessary to have three fans like in pic 2 or will 2 work? Or will i need booster fans at the bottom for intake and have active intake due to my room being 4x4x7 with 1000w hps?. I also have an ac unit that is 10,000 btu directly outside the front of my tents in a window. any suggestions on a way to inquire it..seems like it would complicate things to bring it in the mix but ideas would help.

So if my pix look good and I am ok with my idea to vent then my only question is how to make a light trap?
I was thinking of the metal ducting that is formed like a Z with one end to outside with a vent cover and the other end in my room like a Z painted black inside. I think they sell light traps dont they? any idea where?


Thanks again for all the help.....vent2.pngventing.png
 

The Ruiner

Well-Known Member
thats all ducted? are venting the lighting? or the filter? or pushing air in with a fan? Extracting out with another? too stoned right now...
 
I think you could probably get away with just one fan right at the intake...not two afterwards

Right at the intake?
The fans shown are not at the intake level they are at the top exhausting the air that is being sucked in through the passive intake. Are u saying i should use active intake?
 
thats all ducted? are venting the lighting? or the filter? or pushing air in with a fan? Extracting out with another? too stoned right now...
Nothing is done yet. My plants are sittin in uncirculated room at the time :(....

The pix show the light being vented by being sucked through the fan an duct rather than blown through.It would exhaust and extract the light and air coming in from the passive intake and go through the c/f and out the turbine...
 

fabfun

New Member
i think i understand it use the passive intake it will give u negative pressure which is good
but use some fans in grow room for air circulation will lower humidity and help avoid bud mold
 
so I got my c/f. I thought they were hollow so that you could hook up ducting to one side and the fan to the other. that is not the case. So If i use the passive intake then the air coming through the intake gets sucked through the c/f? so its c/f ducting/ hood/ ducting/fan/exhaust out? will the passive intake air pass through the c/f? I have a 500cfm fan an its a 4x4x7 room
 
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