Let's see if I can remember off the top of my head.

Roughly 4'W x 3'D x 28" to 30"H
http://boards.cannabis.com/attachmen...-light-008.jpg

Venting is a 120mm Fan to a scrubber. Fan is rated at 108CFM. 4" ducting all the way through. Recently added a cool tube to the 150 HPS which of course is inline with the fan and scrubber.
http://boards.cannabis.com/attachmen...-light-054.jpg
http://boards.cannabis.com/attachmen...-light-072.jpg

There is a 2" passive intake to the cab which is an ABS 90 and also a 1-1/2" Active intake.