3D Printing Ultimate Bridging vacuum duct Crazy idea

Ultimate Bridging 3D Printing vacuum duct, maybe ?? CRAZY!!

Instead of blowing air to cool filament use a vacuum to draw air in and up
to overcome gravity which causes the filament to sag while bridging

This has not been tested. It is just an idea. A Crazy idea?
One issue is that the nozzle may push the filament down..