The element of fire flares upward with its flames reaching to the sky. And so our breath also flares upward when we breathe in through the mouth and exhale through the nose. With only five slow fire breaths done after the earth and water breaths so too does our consciousness become lifted.
Here are the directions for doing the Fire Breath associated with the third chakra at the solar plexus:
Inhale through the mouth and exhale through the nose 5 times with the concentration of vitality and passion; the color choices are yellow or gold for the third/solar plexus chakra.