The Cross House
The chute has three metal bars preventing any larger object from falling into the chute.
The petite door was held by two incredibly powerful spring hinges. One could not just open the door and leave it, as it would instantly snap shut. No, one had to bend down, open the door, HOLD IT OPEN, and then sweep.
This seemed…unlikely to me. Although, a normal hinge would mean that the door could be left open, which would allow a baby or pet to get into the chute and…well.
So, perhaps it IS a debris chute?
Have you ever seen anything like this?