For a perfect control of our heaters, we recommend our CSN® Standard Control System for Air Heaters 810/4-63 control cabinet main switch main fuse control fuse steps switch indication light Materials used for our air heaters: housing: stainless steel AISI 304, CSN® Tubular heating elements exchangeable, material AISI 309 similar, fan, Terminal box: steel powder-coated RAL 7035 Temperature controller and limiter