The R3400 fiber-cement saw collects dust very efficiently. A fan in the back of the tool pulls dust out of the blade housing and feeds it through a hose to a fabric filter attached to the top of a drywall bucket. The exhaust air escapes through the filter and the dust passes into the bucket.
The saw takes a 5-inch blade and has a fixed depth-of-cut of 13/16 inches. Here it's being used to gang-cut HardiePlank lap siding.
At the end of the day, the carpenter removes and cleans the filter (left), empties the bucket, and stores the filter, clamp, hose, and saw inside (right).