Check out this DIY Litter Box Exhaust System. If the smell from your cat’s litter box is enough to have you cleaning the box many times a day you should consider an exhaust system. It was built using a 120 mm computer case fan, 4″ dryer duct, 12 vdc power supply, steel cans, electrical tapes, long zip ties, plywood and a few other various household items. Some required tools are hot glue gun, knife, drill machine and permanent marker.
“This project costs less than $35 to make and can be prepared from affordable household’s and recyclable objects. The design is perfect for apartment dwellers.”
