With these attachments for the air vents of the Truma heater, you can easily direct the warm air in the desired direction.
The heater vents are also available in a set of 5 here:
Heating vents set of 5
Please note:
The vents may only be installed or removed when cold.
If you have a diesel heater and it regularly burns out, please MUST remove the vents before starting the process.