The fan was purchased to replace one in a display refrigerator. On installation the first issue noticed was that there was no way to reach the mounting points without drilling access holes in the fan cowl.
The fan ran smoothly and was quiet for about six months after which it became progressively noisier and out of balance.
On investigation I found that the manufacturers had chosen in their infinate wisdom (or the persuit of profits) to utilise nylon bushes instead of something more robust such as phosphor bronze - seriously people?
There are those who would say that using a fan designed for an oven on a fridge is a mistake but I would argue that a fan is a fan regardless of where it is utilised.
In summary a shoddy product with built in obsolescence.