By creating combining the key features of an extractor fan and a fan speed controller, Prima Klima has been able to develop these forward-thinking, super effective products for ventilating grow room. With minimum fuss and maximum success, PK Temperature Controlled Extractor Fans let you manage air exchange according to your selected idling speed and grow room temperature, only switching to full speed when suitable conditions need restoring (e.g. if it's too hot). Given that UK temperatures often range from one extreme to another, the need for a flexible fan is obvious. Offering convenience, quality and user-friendly controls, PK Temperature Controlled Extractor Fans provide the simplest means of managing temperatures in single light applications. However for multiple intake and outtake fans, we do still recommend using a KlimaVator or Fan Speed Voltage Controller.