Aqua Gardening stocks grow room fans from 100mm all the way up to 400mm. Fresh air is vital for plants in indoor living soil gardens as it brings in the fresh CO2 that they breathe, while also removing excess humidity. We stock the most common grow tent fans that are used in indoor living soil gardens 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 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 indoor living soil garden, you can use our handy online grow room fan calculator.