Horizontal still has 1:40 drop (1 cm for every 40 cm). Please refer to images attached.
But the concern is, as soon as the waste exit from the pan, its going to hit the bend, is this fine?
After exit, the soil pipe runs 11 feet and falls into a clay pipe in the floor. (an old toilet used to be here, floor is concrete)
Does the soil pipe need a vent?
