When a fire fighter's only means of egress is through a window or off of a roof line, it's best to keep it simple. The new Personal Rescue System from Lion Apparel is easy to use, always there, and can be used with any Class II lifesafety harness or escape belt (available seperately).
Everything you need in this NFPA 1983, 2006 Edition manufactured system.
Components include:
50' CMC ProSeries Escape Line
CMC Escape Artist descent control device
2 CMC ProTech Carabiners
Stainless Steel Quick Link and Tether constructed of DuPont KEVLAR