Bilge Blower

The old ( I think original) bilge blower in my boat is dead. Does it matter what I use to replace it? I am thinking of putting in a 3inch inline blower, but just want to make sure it is the right one. Also do i want the blower blowing into the bilge or out?

Here is what I am thinking of using:
http://cgi.ebay.com/ebaymotors/ws/eB...category=26451

Any advice?