ri-f
Senior Member
Adding fuel to the fire...one other issue has been widely reported, with regards to the circuit board. beyond the issue of voltage spikes killing boards (the boards can handle up to 15v, but not sustained, they want to see less than 13.8 on a regular basis - ideally 12.9v, which you can achieve through a regulator), the other issue is condensation on the boards for any model made before 2019. It is recomended to apply a conformal coating the board (both sides) as well as the back (not the face) of the keypad with something like CRC urethane seal coat, and also plug the hole where the power wires enter the fan - where water droplets can drip onto the circuit board. No kidding, this is now considered preventative maintenance for a product that is poorly designed (at least from an electrical point of view). It's still a great design in other aspects though, which is why many people are willing to put up with all this stuff and take these extra lengths to preserve the integrity of the printed circuit boards on these fans which are, electrically not well designed. The newer fans 2019-present, have a conformal coating on the PCB, which should prevent the condensation issue. But the voltage should really be regulated to 12.9v to prevent failure.