FM approvals is the independent testing arm of international insurance carrier, FM Global. FM approvals uses scientific research and testing to make sure products conform to the highest standards for safety and property loss prevention. Products that pass get the “FM APPROVED’ mark. Think of it as the Good Housekeeping seal but only better. That said, Solatube has successfully undergone testing and has achieved the “FM Approved” mark in order to offer you the highest rated products available.