Vortex VTX600L-D 278 CFM 6" Inline Fan with Dial-A-Temp SPEED CONTROL they are fluted on both

they are fluted on both ends to ease connection to ducting

and integrated flange

10-year warranty

for 4 in diameter duct

Vortex VTX600L-D 278 CFM 6" Inline Fan with Dial-A-Temp SPEED CONTROL they are fluted on bothManufactured in Canada, the Vortex Powerfans In Line Duct Blowers are ideal for use in general purpose exhaust and duct boosting applications. The variable speed control fan kit includes a Vortex Powerfan 278 CFM VTX600L and a Dial A Temp speed control. This kit also comes with galvanized mounting brackets allowing either horizontal or vertical installation. VTX600L design features: Supplied with mounting bracket for easy installation. Suitable for