Patent ID: 8367985

Claim:
In a mica board electric resistance heating wire heater comprising a frame, a plurality of mica boards, with each mica board supporting electric resistance heating wire, each of the mica boards having first and second opposing ends, each of the first and second opposing ends supported by the frame, the improvement comprising: first and second mica board support plates, the first mica board support plate supporting the first opposing ends of the mica boards and the second mica board support plate supporting the second opposing ends of the mica board so that the first and second opposing ends of the mica boards are isolated from the frame, and a first mica board support plate holder adapted to hold the first mica board support plate and a second mica board support plate holder adapted to hold the second mica board support plate, the first and second mica board support plate holders being either part of the frame or an additional support structure with the frame.