In a word no. I may be wrong, but I think that air is drawn in through that vent, amongst other places, and exits thorough various gaps in the cleaner. The hood as I am sure you know is not air tight or sealed. There are gaps in the chassis and all around the area where the fork enters the cleaner. In order to feel anything through that vent, be it air sucked in or blown out, you would have to seal up pretty much all the gaps in the cleaner and seal the hood down. That way you'd know for sure.