On February 7, 2012 Mason-Lite passed the AC-156 seismic test requirements set by Garwood test labs for our MFP 63 firebox. These requirements are set forth to withstand severe seismic conditions in regions with high seismic activity (California etc.). The test involved thorough shaking on the vertical, horizontal and diagonal axes. Our MFP 63 passed the rigorous testing insuring that it is safe under extreme seismic settings. This is verification of how strong and durable our product really is and how we stand behind it.