The truth is Ferris= Iron Containing metals are the real danger around MRI machines even when they are turned OFF. Many FD Tools contain iron ins some form. Leave your tools and SCBAs outside of the room and area of ANY MRI Machine. Even a member radio can be pulled into an MRI device. FD Tools and other Ferris containing objects of any kind, have been pulled through sheetrock walls into MRI Machines. Remember some MRI machines are located in trailers outside hospitals and other health care facilities, including most places where X-ray equipment is also present. So any medical center, doctors office requires caution, but also some colleges and research facilities have MRI equipment. Alot of weighted vests contain LEAD based weights which generally is not as big a problem, but you never know. Captain Bob Rainey FDNY Engine 26 retired.