Xpower Negative Air Machines,Blue,21 5/8 in H X-3580

4-stage filtration system including activated carbon filter for effective odor control and HEPA filter that can remove 99.97% of 0.3-micron sized particulates Lightweight compact and durable ABS plastic (the same that football helmets use) housing design Powerful and energy efficient 1/2 external rotor induction motor low 2.8 Amps draw with 600 CFM airflow 5 speed control switch filter change light indicator & stackable up to 5 units high for easy storage ETL / CETL safety certified dual thermal protection & 1 year manufacturer warranty Product Dimensions:19.6 x 12.3 x 21.6 inches Item Weight:32.8 pounds Shipping Weight:36.2 pounds Manufacturer:XPOWER Manufacture Inc.