No need fan room. 1 Inline Duct Fan. Hon&Guan 4" 6" Silent Fan Extractor Duct Hydroponic Inline Exhaust Industrial. Hon&Guan 3in-8in Flexible Duct Ventilation Extractor Fan Vent Hose Pipe 2.5M-10M. Hon&Guan 4" Inline Duct Fan Set for Duct Ventilation Installation Exhaust System.
eBay