I was given a whole house vacuum system when they rebuilt the house next door. I cleaned it up and installed it my 1 car garage sized shop to use with my scroll saws, sanders, drill presses, and to vacuum the shop floor and my cars and truck. I installed an inlet port on each floor of my small shop and an inlet through the outside wall next to where I park my cars and truck. I added an Oneida Dust Deputy separator in the line ahead of the vacuum. I've been using this system all day most days since it's installation last Spring.
The unit itself with the Dust Deputy and 20 gallon collection barrel are located in my shop's attic.
The Dust Deputy has removed all of the visible sawdust from the air stream and the filter in the central vacuum is still just as clean as it was when I installed the system last Spring. The exhaust from the vacuum unit is piped to the outdoors, so if by chance the super fines are getting past the filters, it is going outside instead of back into my shop. I put large hooks across my shop ceiling in the general direction of each tool area, so I can re-route the 25' hose to where I will be working, yet keep it off the floor. I can now scroll saw with much less saw dust in the air or on me. I haven't yet figured out a good way to collect the saw dust from the top of my scroll saws, but it is collecting 98%+ of the bottom saw dust. Having an inlet outside near the parking area lets me clean my cars and my truck very easily too.
A new whole house central vacuum is quite expensive to buy new, and for most people it would probably not be worth buying one for this purpose, but mine was totally free and cost me slightly less than $150 to install it, which included the cost of the used Oneida Dust Deputy that I bought from a friend who was closing his commercial woodworking shop. It isn't a big enough system to collect sawdust and chips from my Unisaw, jointer, or planer, but it handles the rest of my saw dust problems quite well.
Charley