Is this shower p-trap j-bend backwards?

[Atomic1]

My plumber is doing rough-in for a bathroom. This is the p-trap he installed for the planned walk-in shower. Is the j-bend in the trap backwards? From what I can tell, the j-bend is backwards. If so, is this a big enough deal to have him re-do?

 

[Terry]

I think you are fine with that.

 

[Sponsor]

 

[hj]

No problem. It was done because of the limited space.

 

[Stuff]

Can anyone explain why the U section of a trap usually has a tighter radius on one side?

 

[Reach4]

Can anyone explain why the U section of a trap usually has a tighter radius on one side?

It is a small effect. https://terrylove.com/forums/index.php?threads/sink-drain-too-high-help.66822/page-2#post-497326 https://en.wikipedia.org/wiki/Brachistochrone_curve