Yamaha CS80

Hi again guys.

I have made a stand from 12 mill plywood that runs around the sides 
and back of my 80 and has two shelves for some of my other gear. My 
question is, although there is space ABOVE the vent slots on the left 
hand side (power suppy)- a good 4 inches, because it has been 'walled 
in' so to speak, it gets quite warm in there. How much ventilation 
does an 80 require, and if it IS slightly restricted might that 
improve the tuning stability?

I could always install a small fan to blow the hot air away if need 
be.

Cheers.
TOM