The PHI Package Unit by RGF® is designed to eliminate sick building syndrome risks by reducing odors, air pollutants, VOCs (chemical odors) smoke, mold bacteria and viruses*. This product is designed specifically for package systems and utilize adjustable magnetic feet to attach, without a fastener, to the blower unit itself making installation a trouble free as possible. This 24V model connects directly into the control box of the HVAC unit. Now available in 5", 9" and 14" cells which will handle package products from 1 1/2 tons to 20 tons. Perfect for all applications where duct work is hard to get to.