4″ Steel inline duct fan (plastic impeller)  https://sunlightblower.com/9609.html

4″ Steel inline duct fans  https://sunlightblower.com/9464.html

6″Steel inline duct fans  https://sunlightblower.com/9465.html

8″ Steel inline duct fans  https://sunlightblower.com/9466.html

10″ Steel inline duct fan  https://sunlightblower.com/9542.html

12″ Steel inline duct fan  https://sunlightblower.com/9543.html

Hydroponic ventilation fans , inline duct fans with  carbon fibre filter , 4 inch (100mm) ;6 inch (150mm); 8 inch (200mm); 10 inch (250mm);12 inch (300mm)  different sizes .