1. Fill the space above with something that is open enough to allow air flow but dense enough to keep a cat out
2. Some sort of wire mesh like a little fence they can't get through
3. build a a box out of wood about the same size as the top of the integrated but open on top and bottom to allow airflow, like a chimney
4. a big snake
2. Some sort of wire mesh like a little fence they can't get through
3. build a a box out of wood about the same size as the top of the integrated but open on top and bottom to allow airflow, like a chimney
4. a big snake