no... i just have an open ballast. i thought I would be able to get away with it because its winter but i guess not. for next run if i run at the full 630w ill have to invest in some fan system to get rid of the heat. i dont think my ballst can hook up to a fan itself, so ill just have to get like a window fan to blow on it or something. that or just run it on 480w instead.
Yes, if growing in a room tough to vent without putting holes in wall. I use 4 X 8 tent. When using HID I used cool tubes, so no heat issues in tent since all contained in airstream of fan and flexible conduit.
Now with LEDS I just connect fan through duct to top of tent and am fine, since LED's have to be backed off 2 feet due to intensity.