Fridges with built-in water filters are usually side by side models with built-in ice and water dispensers. If you have a fridge like this then you should look for the filter in one of three places. 1 Inside the refrigerator compartment hanging down from the top of the fridge. Look for cylinder shaped plastic or metal canisters. 2 Inside the refrigerator compartment, some filters slide out or drop down from the ceiling of the fridge. 3 Located in the grille at the bottom front of the refrigerator.