<a href=showthread.php?s=&postid=8034763#post8034763 target=_blank>Originally posted</a> by Fizz71
Because of mounting concerns I had to blow in from the back. I chose in because of reduced salt build up, but I've heard every combination including one in and one out so I don't think you'll find a definitive answer that's not opinion. If your hood is closed pretty tight, one in and one out would probably get the best flow.
You do want to make sure you are NOT blowing onto your MHs...they are designed to work in their own heat.
As for hooking it up...the last fans I had were 110s so that was a no brainer, but back when I had bought regular fans from radio shack I bought the power converter that matched the fan's and cut the plug off to re-wire the fan to it. You just have to make sure you get the right one for the fan's power requirements.
Do they make them all the way down to PC levels? I'm not sure.
--Fizz