Tomahawk Bat One Way Door is a simple solution to excluding bats from a space. It is easy to install and can be left attached until all the bats have exited. The bats need to leave eventually for food and water, so it is a safe way to get rid of bats. Once they are all gone you simply need to patch the hole.
Bat cones must be installed at a downward angle. You must also be sure to seal all other entry/exit points to ensure the one way door is effective.
Please be sure to not install a bat cone during the bats birthing season. This may cause baby bats to be trapped inside. A rough time frame for when bats give birth is late May and into June.
Here is an example video on how to install a bat cone:
Bat Cone Installation Video