5015 Blower Duct for Wanhao D6 / Monoprice Ultimate with viewport

Update 10/04/2017: Added photos showing clearance at X200 Y0. It comes very close to the frame, but makes no contact, at least on my machine.

Modified 50x15 blower duct by claancy with a view port (I just cut a chunk out of the front so I could more easily watch the first layers of prints go down).
It's probably not ideal, but I haven't noticed any decrease in performance.