Best answer, is latewood's... but my answer might add a little.:::

I have a Bake A Round cool tube setup... It's running a 400W MH inside, and it's getting the air pulled through by a 90CFM 6" fart fan.

It works. The cool tube isn't "cool" to the touch, but it works fine.

Hope this helps,

-turtle420
.
turtle420 Reviewed by turtle420 on . Anyone Help me with this cool tube question pls! will a 105cfm effectively cool a 400w bake a round cool tube setup? It looks the part but im not sure, What cfm would i need to do it very efficiently? Rating: 5