u/ALEXGP75O

https://preview.redd.it/nwjk1ut77r0h1.jpg?width=2608&format=pjpg&auto=webp&s=a16ec7518cd6a43993a4a5d9bd9ce54de0d5ef8c

https://preview.redd.it/ka8xvrg97r0h1.jpg?width=2608&format=pjpg&auto=webp&s=e26ecc11cf014f51fb4fa5da310d40a23c00ad48

https://preview.redd.it/prsn680b7r0h1.jpg?width=2608&format=pjpg&auto=webp&s=f4de8cbe3182f8ff2e15141e0c9f3e0b4a5532b0

2 litter boxes connected with an extraction tube and an 12V 80mm fan. The tube inside contains activated carbon, it works really well.