0Re-design 11 years ago Very carefully. It depends on how it was installed. Some of them are just like a picture frame and mount to the face of the wall opening. You can take a thin bladed putty knife and force it behind the mantle. Others are built into the wall and may be very difficult to remove without damaging. Since we're not there to look at it, you'll have to determine how it's mounted and work from that info.