Yield Lab 4 Inch 190 CFM Air Duct Fan Vent System by Yield Lab HIGH PERFORMANCE FAN: If you are looking for a powerful yet compact fan, look no further! Boasting an optimal 190 CFM and 3100 RPM, you can insure proper air circulation. With a balanced motor and lubricated ball bearings this fan will continuously run as long as you need it. Not to mention with a solid metal construction and powder coat housing, this blower is built to last! THE COVERAGE YOU NEED: Whether a small grow tent, or a larger size room most people do not have proper air circulation. Without a proper fan or ventilation system, you can experience stale air, foul odors, and unmanageable heat control which can stop your grow in its tracks! Luckily with the Yield Lab 6" Duct Fan, you will never have to worry about such issues again. Simply install the fan into your current ducting and in moments you will have proper air flow to take care of your plants. VARIABLE SPEED CONTROLLER: Enjoy the accessibility and ease of use of a built-in fan motor controller. No need to purchase an after market controller. Simply install the fan, plug it in, and you are set to go! Come experience a high quality fan with the control at your fingertips. WIDE VARIETY OF APPLICATIONS: If you do not have a grow tent, do not fret as this system can be applied to many situations. These can include but are not limited to; greenhouses, kitchens, bathrooms, grow rooms, and many other HVAC set ups. So whether you need an indoor or outdoor air circulation blower, this fan is for you. INCLUDED COMPONENTS: 1x Yield Lab 4 Inch 190 CFM Air Duct Fan Vent System.