Hon&Guan
Hon&Guan 100mm Inline Duct Fan, 204 CFM Ventilation Exhaust Fan for Kitchen, Bathroom, Growth Tents, Hydroponics(4 inch)
iPower
iPower 4 Inch 195 CFM Inline Duct Exhaust Air Vent Booster Ventiliation Blower for Grow Tent, Attic, HVAC, Basements or Kitchens, Low Noise, 4'' Fan Quiet, Black
TTiiLoe
TTiiLoe Inline Duct Fan 2 Inch 50mm Ventilation Exhaust Booster 62 CFM Quiet Fan Filter Duct Kit 6W 12V Intake Fume Extractor Blower for Attic Kitchen Grow Tent (2 inch/50mm, Not Adjustable Speed)
DUCTURBO
DUCTURBO 4 Inch Inline Duct Fans, 160 CFM Ventilation Exhaust Fan Ideal for Indoor Heating Cooling Transfer Or Grow Tents Air Boosting, With Variable Speed Controller