The RGF 9" Package PHI Unit Air Purification System PHI-PKG9-24V / PHIPKG924 is a high-quality air filtration system designed for use in HVAC and refrigeration applications. This unit, featuring the PHI technology, effectively removes impurities and contaminants from the air, ensuring clean and healthy air circulated in the designated space. With its compact 9" size and reliable brand reputation, this package unit is a valuable addition to any industrial or commercial setting requiring efficient air purification.