XPOWER X-3700-2.0" HEPA + 1.4" Activated Carbon Air Scrubber Commercial-quality 4-stage filtration system including a 1.4" activated carbon and a 2.0" HEPA filter. Lightweight, compact and durable ABS plastic (the same that football helmets use) housing design 1/2 HP external rotor induction motor, low 2.3 Amps draw with 600 CFM airflow; Powerful and energy efficient. Variable speed control switch, filter change light indicator & stackable up to 5 units high for easy storage ETL/CETL safety certified & 1 year limited manufacturer warranty