This is done through the air vent valve of the TR.
https://butaneindustrial.com/wp-content/uploads/2021/07/Butane.png00SaTajdarihttps://butaneindustrial.com/wp-content/uploads/2021/07/Butane.pngSaTajdari2022-08-28 09:25:152022-08-29 05:17:50Does the TR need to be vented like the other radiators?