iPower 4 Inch 190 CFM Duct Inline Fan with 4" Carbon Filter 8 Feet Ducting Combo for Grow Tent Ventilation 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. 4 Inch 8 Feet Uninsulated Aluminum Ducting + 2 Stainless Clamps: Flame-retardant coating and corrosion-resistant wire helix; Temperature endurance range from 0 ~ 185F. (-18 ~ 85). FREE Pre-Filter included: We recommend replace the Pre-Filter every 6 months to protect your filter. 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.