I've decided to replace 12V power supplies with 5V for the fans, in order to reduce potential bodily discomfort and decrease power consumption. If the fan power supply design reverts back to 12V, there will definitely be some sort of protective cover system implemented.
They can be found for cheap but wouldn't be necessary with fans running at 5V. If it were a box design, I'd most likely utilize the fan covers like the many other LED lighting fixtures.
That could be done!
@Bueno Time
Those plants look beautiful! What are your plans for the next grow, in respect to choosing color coordinate temperatures? You mentioned using 4000K, with a few mono reds; is there any chance that you'll be using 3500K or 3000K within the next operation?