It's an honour to recieve a response from your goodself.
I live in Singapore and the room my system is in is not air-conditioned as it is cool enough for my comfort; only a ceiling fan, to circulate the air, is employed.
My previous amp, an Adcom GFA 535 (no internal fan), used to get pretty dusty on the inside and I note that it used to get pretty warm to touch. However, after each cleaning, the amp runs much cooler.
The cleaning involved dusting the circuit board with a soft bristle brush (Chinese Caligraphy type) and a small noozle adapter on the domestic vacuum cleaner's flexi-noozle.
The 4BST, as is, is pretty warm to the touch (much warmer then the Adcom but then the Adcom was just a 60W/ch unit). As it sits on the floor, between the speakers, my concerns is that dust may get in through the vents and settle on the board thus inhibiting heat from dessipating for optimum performance. Though Neil Young reckons rust never sleeps, I think this should extend to dust as well.
Would there be an avenue to prevent dust from entering the amp, some type of ligh netting screen perhaps? Your comments would be much appreciated.