Sometimes I just couldn't believe words are pronounced the way Duo does it. "Fans" here is one of them.
Usually, it's pronounced /fɛns/.
So is this word just an exception to the general rule then?
What general rule?
Isn't "a" usually pronounced like the "u" in "up" is in English?
Right. The pronunciation of English loanwords, however, tends to be an approximation of the original English pronunciation.
Not at all. It's like "father," or "far." If it were like "up," then "mag" would sound like "mug!"
The letter a can be short or long.
short: Masse /'masə/
long: Maß /ma:s/
Can anyone clarify is this means 'fans' as in supporters or as in the cooling devices?
It's fans as in supporters. The German for the cooling device is "der Ventilator".