Filters: A device or a mass of material (as sand or paper) with tiny openings through which a gas or liquid is passed to remove something.

The filter is sometimes also referred to as a strainer. It is critical that these particles are filtered out and prevented from going into the metering device. It can cause blockage to the passage flow of the refrigerant in the expansion valve and cause improper operation to the system.

Some of the filter types used in HVAC systems are;

Some of these components naturally stand out just because their appearance is striking, and they also have unique purposes. But on the flip side, there are also components that aren’t as striking just because their primary functions are relatively simple — though they are still undeniably important.