The Department of the National Research Council Canada has a requirement for the supply of one (1) air bath to replace the current oil bath system and to enable a dry, clean, silent and stable storage environment for standard resistors. The air bath system for standard resistors must provide a temperature-controlled enclosure that maintains precision resistance standards at a stable and uniform temperature. The air bath must provide tight temperature control as this is essential for accurate resistance measurements used in thermometry applications such as standard platinum resistance thermometer calibrations.