iPower 4 Inch 190 CFM Duct Inline Fan with 4 Inch Carbon Filter for Grow Tent Ventilation System 4 Inch 190 CFM Duct Inline Fan Blower: Made with quality UL components for quiet operation. Composite fan blades and center hub which reduces noise and vibration. 4 Inch 1050+ IAV Australia Charcoal Filter: One of the world's most absorbent carbon available; Dimensions: 4" Flange Ducting x 12" Length; Reversible flange. FREE Pre-Filter included: We recommend replace the Pre-Filter every 6 months to protect your filter. 5 Feet power cord Multi-Functional: This ventilation combo removes heat and eliminate the undesirable ill-smelling odors in the grow tent to solves air delivery problems without major system rework or expense. Wide Applications: Kitchens, Bathrooms, Greenhouses, Grow Rooms, Grow Tents, etc