Image Number 15 for United States Patent #7809253.
A fully integrated drying or heating system utilizes forced air and electrical heaters. A solid cartridge heater is enclosed within a heater cavity of a block. The block includes a separate air cavity in heat transfer communication with the heater through a solid portion of the block. The blocks are shaped and configured to be used in banks of plural blocks, with the operating controls and all the components of the air distribution system and air heating system fully integrated into a modular package.