Everyone sets their shop up differently and what works for one may not for others. If you are looking to blow those swirly curls from around the mandrel when doing acrylic blanks I wish you a lot of luck and you may need a turbo fan. If you are looking to blow dust while sanding then you definitely do not have the dust collector set up right and you may need to look at that. I am not one for blowing dust around my work shop no matter how small the project. I even try to do all my sanding of projects out doors and yes I have sanded with snow on the ground. I have a small tankless Craftsman compressor that I use to blow the dust off after sanding. Any sanding on the lathe is easily caught with a dust collector using the same hood as you with the magnets. Any of the big chips will get vaced up after I get done. Mind you I only turn small projects. Works for me. That is the way it is done in my shop.
If I have to sand a project in my shop I do have a down draft table and I have a hose to hook to the dust collector. Any sanding on my oscillating sanding gets sucked into dust collector. My worst dust producing tool that I can not collect is my scroll saws. I can not and there are no good devices for this. I just have to keep the air cleaner running and clean up well when done scrolling. I usually schedule the day for just that type work and when done leave and let air cleaner to clean room for an hour or so. Trying to control dust particles is tough enough without spreading them around needlessly. But as mentioned they do make all different sizes of those hose you shown.
Now the last tool in the arsenal for dust is the trusty long time favorite Tack Cloths
www.amazon.com/tack-rags/s?ie=UTF8&page=1&rh=i:aps,k:tack rags
Good luck in your quest to improve your shop. Remember it is your shop so do as you see fit.
Hey John ... possible fix for dust collecting at the scroll saw!
I understand that normally, it's a bad thing to have dust collection at the scroll saw, especially when working on small and intricate parts that would tend to get sucked into the DC hood and then it's gone!
However .... what if you were to position one of those flex hose attachments nearby and crane it up and over the scroll saw to come down near the work area, and use a clear hood for better visibility and light ... use the cutoff from the dust collector creatively to restrict air flow (suction) by partially closing your cutoff and possibly OPENING another cutoff ... and last, but not least, install a window screen mesh over your scroll saw DC hood to catch any small pieces before they get sucked away!