One of the most common myths about nodules is the diagnosis itself! Usually doctorâs donât have the necessary equipment (stroboscopy) to diagnose vocal problems. So all problems are called nodules. Every singer has a colleague who had ânodulesâ for this reason.
An RTU is a type of AHU. AHU stands for Air Handling Unit and the acronym RTU means Rooftop Unit. The Roof Top Unit is an outdoor AHU. As RTUs are mounted on the roof, there is no concern about creating extra space indoors for it as would be the case for the other types of AHU.
The traditional characteristics of RTUs are: 1  Normally mounted in remote locations and spread out in a wide geographical area. 2  Almost never used in the Factory Automation sector. 3  The number of monitoring points per RTU are normally low, from a few input-output (I/O) points to less than twenty most of the time.