Washdown vs Syphon Jet Urinals

[pspud]

Hello

What's the difference between a Washdown Urinal and a Syphon Urinal? I'm looking at a code book and trying to determine my water supply fixture unit.

Thanks

 

[Mr_David]

Q. "What is a washdown urinal?"
A. A washdown urinal (sometimes referred to a washout urinal) is a flushing system which cleans out a urinal by providing a water rinse over the back wall of the urinal.

Found this video. A little long so go to 2:00 min into the video

Watch video