Air Scrubber (Defend Air HEPA 500) Machine Specification Key Specs & Features Advanced filtration technologyDaisy chain capability – link up to 4 units on 1 power outletVariable CFM on each unit – up to 2000 CFM per 15-amp circuitStackable, lightweight, and easily transportable You Might Also Like Big Floor Fan April 4, 2019 Floor Fan April 4, 2019