Ventilation Help! More intake?

[tk4190]

Hi! Newbie here, first time growing. Been reading for a while and finally pieced together a little something. Bought a basic cabinet from Lowe's for $124. Specs are

-38.5" x 70.5" x 20.5" (A bit narrow but I think I'll be growing autoflowers first, can always built another clone/veg cab later.
-2 MarsHydro 600 (about 272W apiece, so almost 550W) and a Sun Systems 150W HPS.
-Apollo 390CFM Inline 6" Fan
-Homemade Carbon Scrubber
-Lined with Mylar, and inside completely sealed.
-LightProof box for intake (sorry, forgot who, but someone on ICMag, basically a box with 4-5 baffles, little airflow resistance)

Anything else I'm forgetting, please let me know, had too much birthday smoke -.- lol. Nothing inside currently, seeds on the way . Just put everything together inside and ran my fan and what do you know, its running hot. Only have one MarsHydro in there with the 150W HPS and its 81* with fan on 90%. 50% and its 86*. Intake is very free flowing, thanks to the box, has a cheap thin air filter over it that doesn't do much. The box is over 2 4" holes. My fan is rated for 390 CFM, thought it'd pull more....





Anywho, my question is, would adding a few 120MM fans to increase intake work? Or would the big inline fan I have currently just make everything deefficient? Was thinking of two 120MM fans for intake where the holes are currently, and two more on the semi-false bottom.

Thanks for any and all help, and happy Fridays everyone! :cheers:
Thanks for any and all help, and happy Fridays everyone! :cheers:



Thanks for any and all help, and happy Fridays everyone! :cheers:
Thanks for any and all help, and happy Fridays everyone! Hope its filled with smoke

Thanks for any and all help, and happy Fridays everyone! :cheers:

Thanks for any and all help, and happy Fridays everyone! :cheers:

 

[tk4190]

Guess I can't find the edit button....:smack: also forgot to add, I haven't even added the second LED light in. So expecting temps to be in the 90s if nothing is corrected. T_T no good.

 

[tk4190]

wtf....copied and pasted the last line and never posted my pics...ugh. sorry all.

hope this works

 

[tk4190]

thinking of buying 2-4 of these:
http://www.amazon.com/Scythe-Stream..._UL160_SR160,160_&refRID=09WYRZWBGJQCBJSGGRRP

two for the intake holes, and two in the bottom...any ideas? naysayers?

 

[Granger2]

Those fans won't do much. Your problem is that 2 4" holes are inadequate. You've got about 25"sq of intake. You've got about 28" sq of exhaust. Rule of thumb is twice the sq" of intake as exhaust. That's not counting the resistance thru your box and resistance from the filter. You need at least 2 6" holes of intake or about a 56"sq rectangular opening [7x8]. Good luck. -Granger

 

[tk4190]

Those fans won't do much. Your problem is that 2 4" holes are inadequate. You've got about 25"sq of intake. You've got about 28" sq of exhaust. Rule of thumb is twice the sq" of intake as exhaust. That's not counting the resistance thru your box and resistance from the filter. You need at least 2 6" holes of intake or about a 56"sq rectangular opening [7x8]. Good luck. -Granger

Thanks, gonna give that a shot. I read that, but since I have 2 4" holes for intake and the exhaust is actually a 4" that uses 4" ducting. The fan has a reducer on it.

 

[Granger2]

Turn it into a 6" system. If it's hot, move more air thru it. Good luck. -granger