Small Cab/ Exhaust question! Please help!

[Hash Addict]

Right now I have 2 axial fans (90~cfm each) exhausting my cab (check my thread for the cab specs) But need more air exchange! Was wondering if this would work???? Any comments welcome please!

Instead of the 2 axial fans, Ill be running a 4" duct fan like Kole477's:
http://forum.grasscity.com/grow-room-design-setup/456055-step-step-how-exhaust-micro-cab.html[/URL]
And was thinking about putting that fan on top of this juice can scrubber, because its better to pull air then to push right??? Or do you think I should keep the axial fans there, going into the JC filter and have the duct fan exhausting from the can?? Either way heres the link for the JC filter by Nugglord:
http://forum.grasscity.com/grow-room-design-setup/281136-how-cheap-easy-efficient-diy-carbon-scrubber.html[/URL]

 

[FreezerBoy]

Right now I have 2 axial fans (90~cfm each) exhausting my cab (check my thread for the cab specs) But need more air exchange!

Air exchange requires intakes. From what you've written, you have no intakes. Intake area should be double the exhaust.

 

[Hash Addict]

There are 4 intake holes, about 1 1/2" each in diameter... How can I add more intake with the size of the cab?

 

[SmokinSHO]

...

 

[Asil]

I posted in your grow thread but you need to increase you intake to 25sq inches and this is based on you having one 4" exhuast.

 

[FreezerBoy]

There are 4 intake holes, about 1 1/2" each in diameter... How can I add more intake with the size of the cab?

Whatever you used to cut the exhaust holes is used to cut the intakes. This way they are all of equal size. Two intakes for every exhaust.

Four 1 inch holes do not equal one 4 inch hole. The example here is 9 but, it makes the same point.

 

[Hash Addict]

Alright, Well I get that I need more intake, but anyone have any ideas on how to improve intake on MY cab? There really isnt much more room to be letting new air in!?? Should I mount some PC fans in the walls of the box? Thanks everyone!

 

[FreezerBoy]

Use a 4" hole saw and punch two 4" holes in the back wall towards the bottom.

 

[Hash Addict]

Hey FB! Thanks for commenting - got any good ideas / links for a way to light proof the holes? Ill end up filtering whatever I do with panty hose - fungust nats have been showing up off and on - thanks for any replies!

 

[FreezerBoy]

Actually, have you seen this? A 5x9 hole with one of those may be just what you need.