Hi George,

Two reasons. The built in fan creates extra noise, bit like a muted hair drier, and there's nothing you can do about it. Obviously nothing like a router in level, but I'm after peace and quiet. The water cooled spindles are probably about the quietest available, unless you know different. Since I'll be cutting alot of balsa (plus some liteply) I'm hoping that the overall levels during cutting will be fairly low, and I'll be able to hear the radio again. Also, for long runs I don't want to upset the neighbours.

Secondly the exhaust air flow blows down onto the cutting area (although it could be ducted away, but you don't want to restrict the flow). This blows all the fine dust (much of which you can't see) out through your collection shoe before the vac has a chance to grab it. With water cooled there is none of this.