The Hewmain Squirrel One Way door is easy to install and allows squirrels to leave a space, but not return. Using the flanges on the side, the Hewmain Squirrel One Way Door can be installed in a variety of scenarios. It can exclude squirrels from any space they are in. Utilizing chicken wire or mesh metal can ensure the squirrel goes through the one way door.
An alternative one way door is the Tomahawk E 40: Squirrel One Way Door.