Plastic Inline Duct Fan Product Details : SKU#300018 Specifications : 1. 6 Inch 2. 390 CFM 3. 34 dB noise level 4. 120V/60Hz 5. 3-speed controller 6. Plastic fan housing and blades 7. ETL recognized components
http://www.hpsgrowlights.net/ventilation/inline-fan/6-inch-inline-duct-fan.html