1. Can the W5 be pushed back into the room from the outside?

Nope. The W5's window frame adapter has four locking tabs that are turned to secure it after insertion. These tabs accomplish three things:

1. Prevent someone from outside the home pushing the W5 inside,
2. Prevent a child from pulling the W5 into the room on top of themselves,
3. Allow the W5 to pass the UL structural loading test which applies 400 pounds of downforce to the top of the W5 on the outside of the building (that’s a whole lot of cats.)