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By certification 
Product Features:
· Metal Fan Housing and Fire Proof UL94V-0 PBT Fan Impeller Material
· State-of-the-art Digitally Controlled Fan Motor ( EC Motor)
· Supporting Full Range of Input Power 110v-120v / 220v-240v
· Consuming Only Half the Power of Other Regular AC Motor Fans
· High CFM Output and Linear Airflow
· Exceptional Static Air Pressure Performance
· Fully Adjustable Speed Controller
· Double Heavy-duty 6mm NMB Ball Bearing
· Universal Mounting Positions for Easy and Fast DIY Installation
· Metal Fan Housing and Fire Proof UL94V-0 PBT Fan Impeller Material
· State-of-the-art Digitally Controlled Fan Motor ( EC Motor)
· Supporting Full Range of Input Power 110v-120v / 220v-240v
· Consuming Only Half the Power of Other Regular AC Motor Fans
· High CFM Output and Linear Airflow
· Exceptional Static Air Pressure Performance
· Fully Adjustable Speed Controller
· Double Heavy-duty 6mm NMB Ball Bearing
· Universal Mounting Positions for Easy and Fast DIY Installation