Vented condensate drain

[Marc 41]

This is a condensate drain for an AC indoor section installed on a shelf in a hallway closet. It's vented on the suction side of the blower.

Am I correct in assuming that there is no trap installed within or beneath the slab?  Do plumbers ever install traps within or under the slab?

 

[Les 41]

relatively common here in mid-Michigan.  not common in floor drains, only sanitary.  only way to know is visual or a sewer scope. 

 

[Jim Katen 58]

In my area, that drain is generally trapped. It's easy enough to find out for sure.