Foul urine odor when running the furnace

[Jlawles2]

Lenartshorty Edited. Reviewed the pic again and it looks quite sealed.

[Yoda]

😳 Bought traps today and will be looking in the near future for holes to plug. We live in Northern MI so the only outdoor cats I know of around here are not domesticated…

You will find two holes - one each side of the slide bottom corner by wall. They are for slide seal drainage, etc. I believe you can plug them with SS steel wool. There is a discussion on that here somewhere.