Growers trust London Grow to provide reliable and high-performance fan controllers from producers such as GAS, RAM, SMSCOM and TechGrow. GAS delivers units, for both AC and EC fans which automatically sense daytime or night-time periods and adjust the speed of your fans for perfect conditions. Thermostatically adjust your extractor and intake fans with the RAM Pro range of controllers. With SMSCOM hybrid controllers you'll maintain an optimum negative pressure level and temperature range without fan motor humming. London Grow offers top-quality and efficient fan controllers at the best prices on the market!