You guys convinced me.. Crankcase breather?

I currently have a PCV on my drivers side valve cover, and a open breather with no hose to the air cleaner. I have a aftermarket air cleaner with stamped holes for a crankcase breather fitting that I want to hook up. I noticed that hose will connect on the inside of the air cleaner unlike the factory setup this located on the outside of the air filter. Is some kind of filter needed on the inside? Will oil vapors mess anything up? Your opinions wanted.