Don't get me all riled up about muffin fans......
Back before I knew better, I replaced the failing extremely noisy fan in my Coleman 800 watt MSW inverter, with the same exact fan.
I'd thought if I did not use the same exact fan the unit would blow up.
Well the new fan started getting loud in about two weeks.
Sleeved bearing Chinese POS!
Lots of fan options are out there, some of them downright impressive with the effort and technology and design to not only move air, but move air more effectively for less noise and less current consumed.
Here, I ripped the loud 40MM fan from my Schumacher sc2500a and installed a 60mm Noctua, which is basically inaudible. The magic blue smoke is still safely contained within.
Also, I take issue with the locations some products choose to locate their fans. Any resistance behind the fan blades.... the closer the resistance is to the fan blades, make the fan less effective and also make it louder.
I Put a Noctua 120mm fan pushing air through my compressor fridge condenser, replacing a sleeved bearing higher noise higher CFM fan pulling air through it, and performance increased, and noise decreased, and the fan itself draws less than half the current.
Don't believe me, go put your fingers near the back of a spinning muffin fan. Airflow will decrease by a significant amount and the noise the fan makes will increase. Put your fingers in front of the fan and it will move nearly the same amount of air, and make no more noise.
So instead of mounting the fan in a manner where it can be most effective, they just use a higher RPM fan in the most appearance friendly location, as the expense of fan life and noise.
BTW, with muffin fans, you cannot just reverse the polarity to reverse fan spin direction, and the better fan blade impellers will not be effective in reverse.
