This was the first time I’ve had a look inside a computer PSU so didn’t really know what to expect. What I found was tonnes and tonnes of dust. On the front of the case were 2 small fans that suck air through the PSU and out the back of the case. However there isn’t a filter on the front and the fans are right at the bottom of the case, so a fair amount of dust from the floor is sucked in.
After sticking a hoover through it and removing the circuit board, and could have a guess at whether the PSU I had would fit in this case.