Hi all.

I have a 4w x 4h x 8L box and i am having a hard time getting my temperatures down to the high 70's.

Running 2 x 400HPS

They were over 100f and I have installed a 375CFM fan with a carbon sock and the temps are now running about 85f.

There are 4 small 4" fans inside the box and two 4"x6" opening cut into the bottom as passive intake.

I have had to keep the doors of the box open in order to try and kep the temps down.


If my doors are open, does this mean that the fan is not running the way it should and if the doors are closed i will get better air circulation thus decreasing my temps?

Is the size of the fan adequate at 375CFM for a box this size?

What else can I do to lower the tepms?

Thanks in advance as always.
blink_inc Reviewed by blink_inc on . Manging temperature in a 4x4x8 box Hi all. I have a 4w x 4h x 8L box and i am having a hard time getting my temperatures down to the high 70's. Running 2 x 400HPS They were over 100f and I have installed a 375CFM fan with a carbon sock and the temps are now running about 85f. There are 4 small 4" fans inside the box and two 4"x6" opening cut into the bottom as passive intake. Rating: 5