Inside the casing, 2 and 3 lobe blowers:

The function of a 2 and 3 lobe blower primarily involves moving air rather than compressing it. These types of blowers are designed to operate by drawing in air and displacing it without significantly raising pressure. They utilize lobes that rotate in a synchronized manner, creating a chamber that allows for the movement of air through the system.

While it is true that these blowers can increase the velocity of air or create a flow, they do not compress it in the traditional sense that a compressor does. Compressors work by reducing the volume of air to elevate pressure. In contrast, lobe blowers maintain the air at a lower pressure and simply facilitate a larger volume of flow, making them ideal for applications where airflow is essential without the need for compression.

In contrast, the other options imply functions that do not accurately describe the primary role of 2 and 3 lobe blowers. For instance, filtering air or cooling air are specific processes that do not represent the fundamental operation of these blowers, which is centered on the movement and displacement of air rather than its compression or filtration.