AUTHROIZED DEALER/TRAINER FOR THE PETZL EXO AND STERLING F4 PERSONAL ESCAPE SYSTEMS. An aggressive interior attack is an essential strategy for many Fire Departments throughout the U.S. Though largely successful for life saving and salvaging property, working in this environment can expose firefighters to a rapidly deteriorating environment. In worst case scenarios, firefighters are cut off from conventional means of egress, and their only option for survival is a window. In this situation, training is all one has to fall back on. That's why at ECRS we offer classes that emphasize situational awareness with training to greatly improve one's chance of survival. Along with having the proper equipment from the finest products from Petzl America, Sterling Rope and Gemtor inc. Petzl EXO and Sterling F4 Training Courses.