Aqua Gardening stocks grow room fans from 100mm all the way up to 400mm. Fresh air is vital for plants in hydroponics systems as it brings in the fresh CO2 that they breathe, while also removing excess humidity. We keep stock of the most common grow tent fans that are used in hydroponics including duct sized intake and exhaust fans for air flow, small PC fans for extra ventilation, oscilating fans to help the airflow around your plants and ducting booster fans to increase airflow in longer ventilation systems. We also have the latest in hydroponic fan technology including variable speed fans with electronic speed control and silent fans which are insulated to help reduce noise. To calculate the best fan size for your grow room, you can use our handy online Grow Room Fan Calculator.