Picked up a used Twister T6 for $400 and replaced the gear box for $100 and now its like new again.
Hort2O Product Documents
The Hort2O™ Charcoal Filter contains virgin charcoal to provide filtration to your indoor growing ventilation system. Filters are constructed with aluminum flanges, steel meshing, and feature a clothed pre-filter. The 4 in. or 6 in. flange is compatible with Hort2O Inline Fans with Speed Controller.