3,620 CFM and infinitely variable speeds allows you to run this all night for pennies. 18 inch duct connects to a damper over your ceiling opening.
![](http://invisco.com/wp-content/uploads/PIC-16-WHF-MOTOR-N-BLADE.jpg)
3,620 CFM and infinitely variable speeds allows you to run this all night for pennies. 18 inch duct connects to a damper over your ceiling opening.