: I would offset the vent stack at a point just below the window. Offsetting the drain portion just above the floor is just asking for future problems with stoppages.

: : We are thinking of installing a much wider kitchen window where our current one exists.
: : Just to the left of the existing window is the vent stack, which also connects to the
: : washing machine beneath it in the basement.

: : Question - can we reroute the vent stack itself at the kitchen floor level, so that it turns
: : 90 degrees horizontally, runs about 2' to the left of the sink, then turns vertical again to run
: : alongside the new window height, then turns 90 degrees horizontally again above the window
: : and finally connects to the existing top piece of the vent stack that runs through the roof?

: : Or should the length of the vent stack itself be completely vertical?

: : Thanks for any input!