Anyone who has worn an SCBA has logically wondered “how long will this cylinder last me?” And we have all gotten the answer… “It depends”. The United States Fire Academy (USFA) has gone one step further and conducted a study with the City of Seminole Fire and Rescue Department to determine just how long a 4500 psi cylinder will really last. As I have said in many articles, the number one limitation of an SCBA is the amount of air we carry in the cylinder; so having a better understanding of how long a cylinder will last in different environments can be some very useful data. HOWEVER, I must caution everyone that no two users are alike and sometimes usages can vary widely. But this study was quite interesting…