iPower 4 Inch 13- CFM Inline Duct Fan with Speed Humidity Temperature Controller for Grow Tent Ventilation, 4", Black Water Filtration Air | Water | CO2 Classic Accessories Veranda Ottoman/Table Cover

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This allows your plants to achieve a balance between respiration and photosynthesis in high intensity growing environments where the rate of respiration can sometimes exceed the rate of photosynthesis

iPower 4 Inch 13- CFM Inline Duct Fan with Speed Humidity Temperature Controller for Grow Tent Ventilation, 4", Black Water Filtration Air | Water | CO2 Classic Accessories Veranda Ottoman/Table CoverPerfect for grow tents, greenhouses, kitchens, basements, locker rooms, garage to reduce humidity and circulate fresh air. Integrates the functions of humidity monitor, indoor thermometer, digital timer, alarm and fan speed controller. 9 Speed intelligent controller from silent to powerful. Mixed flow design combined with DC eco watt motor for a truly quiet and energy efficient performance. Specifications: Size: 4 inch; Input voltage: AC 110 220V