iRobot Roomba 4100 Filter Replacement

Lay the Roomba on a flat surface with the red side up.

Push in the red, gumdrop-shaped button with your thumb.

While holding in the button, slide the back piece away from the main body of the Roomba.

Flip the back piece over in your hand.

Using your other hand, grab the yellow tab and pull it away from the back piece.

Pinch the black plastic of the filter and pull it away from the yellow filter holder.