Ventilation questions

my room is 4ft tall, 2ft wide and 1 1/2 ft deep. i have 1 x 120 pc fan as exhaust, and another as intake.

I just got a small 4in fan and was wondering should i use that as the exhaust and 2 120 fans as intake

or

Use 4in fan as intake and 2 120 fans as exhaust??

+rep for quick answers

heres the whole grow

https://www.rollitup.org/grow-journals/564556-cfl-homemade-closet-grow.html

You want your exhaust to be more powerful to create negative pressure in your room.

ok, so should i use that one 4 in fan or both 120 pc fans to get enough negative pressure?

Pc fans don't have the static pressure of an in-line fan so they don't create very much negative pressure. I'm not sure what kind of a four-inch fan you have so I can't comment on that one. You may just have to play around with the set up and see what the temps are. If you're still using the CFL's like at the beginning of your grow I would switch to an HID light and a better 4" can type fan so you can add a filter and you won't need any other type of fans..

Good luck

You need to go inline for that large of a space.

My 4 in fan is a lakewood personal fan. you know the small ones, that have the bar around the back that holds it up. i pried the bar off and its just fan (case is still on it so not to chop the ladies)

where can i get an inline fan that is quiet? i would prefer not to have to order it online, if possible.

It doesnt seem that big to need an inline fan....

would i use the inline fan as intake and 4inch fan as exhaust? or opposite??

(limited budget)

With a decent inline you do not need an intake fan because the exhaust will cause fresh air to be drawn in. You can quiet one with a speed controller. Can get them online or in your local hydro store. Limited budget I've used a $15 home depot bath fan with a 400 hps. Those are as loud as a bath fan in your house.

This is also a stealth grow. and its almost winter, so i dont want people to wonder why i have a loud ass fan blowing... lol

What type of inline fan would you recomend??

like this
100 cfm 4 inch fan.

.....or like this?

• 
  [*=left]Air Flow: 190CFM
  [*=left]Speed Fan: 2730 RPM
  [*=left]Power: 68w
  [*=left]Input Voltage: AC 110v/60Hz
  [*=left]Current: 56A
  [*=left]Dimension: 8" x 9" x 8.5"
  [*=left]Fan Mount Included

The first kind of inline you have a pic of is a booster. These have lower static pressure and are usually rated way higher cfm then they. the second type is the kind you want. The cfm is pretty low but will work for that space. that being said cheap inlines are notoriously loud. There are some pretty good DIY on honeywell turbo velocity fans being modded to cool grow rooms. Those are like 15 bucks. Il try to find a link later its late lol

Check out this thread I made for a cheap inline alternative. If you don't want to buy a more expensive one. Up to you. But It has a 300 cfm.
https://www.rollitup.org/grow-room-design-setup/573499-cheap-alternative-inline-fan.html

The second one. With that you can add a carbon filter if the smell gets to much.