Quicken Breath

 
Prerequisite(s): Con 19+, Breath Weapon.
 
Benefit: Using your breath weapon is a free action. When you use this feat, add +4 to the number of rounds you must wait before using your breath weapon again.
 
Special: You cannot use this feat and the Maximize Breath feat on the same weapon at the same time.
 
Source: Draconomicon