The exhale is relaxed with no control at all. If the inhale comes via the nose then the exhale should also exit the nose. If you inhale through the mouth then the inhale must travel out the mouth. Exhale and inhale need not be the same duration. Don't stop at the top of the breath or at the bottom.
Breathing is one continuous loop.
Circular breathing balances the body's subtle energy systems and breeds acceptance and emotional integration. This increases energy flow. The Crown Chakra is a point at the very center of the top of the head. The Third Eye Chakra is located at a point a half inch up from a point directly between the eyes. The Heart Chakra is located in the center of your chest about 5 inches above an invisible line between your nipples.