The default Radiation Temperature for the Thermal Environment is retained.
- Select the Continua > Air > Models > Gray Thermal Radiation > Thermal Environment > Radiation Temperature node.

- Check the Radiation Temperature is set to 300 K in the Properties window.

- The Radiation Temperature for the solid continuum may also be checked by selecting the Continua > Glass > Models > Gray Thermal Radiation > Thermal Environment > Radiation Temperature node.