Mammoth TT Twin Speed fans get the job done, and for a very reasonable price. They've got everything you need to get started, straight out of the box - with no wiring or extra parts required. They also feature two speed settings so that you can gain some additional control over your environment before investing in a fan speed controller. For the more serious growers out there, we recommend using a digital fan like the Hyperfan or the Revolution Vector EC, which are more efficient, powerful and controllable - but if you're just getting going, Mammoth fans represent phenomenal value for money.