quick vent question

In a small closet like grow room I have a 5'' fan on 7'' hose.

For maximun ventilation Do I want the fan at the front (Top of the room, blowing into the hose)? Or sucking the air into the hose from the bottom of, even outside the room?

anyone?
does it matter?

Top, blowing into the hose.

I've now tired both, I used smoke from a joint to somewhat messure the flow and it seems about even with both set ups. but still not seeing as much flow as I should considering the power of the fan.

are you sealing off the gap between the fan and the hose? can you post any pictures for us to get a better idea of what you have? usually, you'd have an exhaust fan blowing or pulling air out from the top of the room. heat rises, so this is where it will be warmest. if you pull air out rather then push air in, you will create a slight vacuum in the room and keep any oder in the room, instead of pushing the oder out of any cracks.

k here are some shots, I did it with a cellphone so they're kinda shitty
the white box at the bottom has the fan inside.

The reason I moved it to the bottom(sucking air from the top) was because i was getting alot of pushback out the back of the fan.
also took the backing off the top 10'' of the inside of the closet door so the large fan is pushing air out of the slits in the top of the door when its closed.
Smell isn't really the issue, I'm going to add a carbon filter sometime during veg.
But the humidity is at about 65 and the tep is staying around 30C. from what I've read the humidity is way to high.
Also have a large ceiling fan in the outside room, as well as a 3.4'' computer fan on a 9v pointed at my main lighting.
Is the problem with lack of intake?. would more intake cut the humidity?

how about a shot of the whole room? how big is the room? you might just need a more powerful fan. what light are you using, and what is the temperature in the main room that you're pulling fresh air from?

I think i've fixed it, I now have the exhaust fan blowing into the closet, a 3.5'' fan blowing out, aswell as a 1' fan at the top, I took the clover off the top 10'' of the door so the top fan is blowing out the slits in the door as well as rotating around the top.

using CFLs and fluoro tube
outside room is 22-24c
inside is 30-32
got the humidity down to about 55-58
the closet is 4x2x8

heres the new system
#1/2 exhaust
#3/4 intake

cfl's and fluoro's shouldn't be to hard to keep cool. I have 12 cfl's, 100 and 150 watt bulbs, in a 8x8 room. a 300cfm exhaust fan. I had to cover the fan with tape so only about 50cfm of air gets pulled from the room, and I put a little devil heater in there to bring the temp up. winter is much easier to keep the temps down. I've been trying to keep the temp at 25.5c and 50% humidity. how are your plants doing? growing like weeds I hope?

i can literally watch them grow. its so awsome.
soil is dryin out kinda fast tho, the humidity is staying around 55-60 and the temp last time i checked (20 mins ago) was 28c

Stoner87 said:

i can literally watch them grow. its so awsome.
soil is dryin out kinda fast tho, the humidity is staying around 55-60 and the temp last time i checked (20 mins ago) was 28c

Click to expand...

it's amazing isn't it. the lights go out and I go to bed, then I get up in the morning after the lights have been on for maybe 3 hours and I have to move the lights up again. I'm always looking at them, but I guess not often enough, because I walk out of the room, then the next time I come back a leaf is an inch longer. life is gods wonderful creation. mine is ebb and flow. 50 pounds of fish tank stone in gallon milk jugs with the tops cut off. the roots have overed the bottoms of the pots already. the nutes are still at about 50% strength and I'm raising it slowly as they get big enough for it. I can't wait to try taking a clone off one.

your temp and humidity should be ok for a while if it stays there.