If you’re using CFL lights in a grow tent, and need some airflow, one of the simplest solutions is to add a small solar powered fan. As long as your lights are on, the fan will spin. I recently purchased a $5 solar fan, designed to be clipped on to a hat, and it works even under my consumer 35W CFL lights in my chilli pepper tent. It provides enough airflow to prevent mould and stagnant air, and also help the trunks of my chilli plants grow nice and strong. It isn’t anywhere near strong enough for ventilating heat, but for most CFL grow tents, heat isn’t a problem anyway.
And the best thing of all is that it costs NOTHING to run.