Application and operation: The OD-11V/TR variable swirl diffuser is designed for the supply of cold or warm air to high rooms (3-12 m) under high induction requirements. The thermostat element built into the diffuser, automatically controls the direction blade angle depending on the supply air temperature, and thereby automatically controls the air jet direction (vertical or horizontal). The correlation between the supply air temperature and the blade angle is shown in the diagram below. The advantages of OD-11V/TR over the motor driven OD-11V design: automatic blade angle adjustment with no external energy source (energy saving) no electrical installation required (simple installation) lower price