Marketing InformationAn AC filter drier, such as this Emerson™ filter drier, removes moisture and contaminants from an AC unit, ensuring smooth operation and preventing compressor failures. This ADK HVAC filter drier is made for a heat AC pump application that uses CFC, HCFC and HFC refrigerants. Filtering is necessary as these particles could otherwise cause blockages to the flow of A/C refrigerants in the TXV thermal expansion valve, leading to malfunctions in the HVACR system.