Because I already have compressed air reticulated around my shed if I was going to do it, this is how I would do it.
https://www.woodworkforums.com/f200/w...ght=maxxsinner
In order of increasing priority (assuming like any decent gate it seals reasonably well)
1) Be lightweight enough to hang off PVC ducting alone. ie no additional additional weight supporting mechanisms required.
2) Rapid opening and closing - <1s (ie clunk!) would be preferred but I suppose I could live with 3s?
3) Be interlinked with DC operation so that the right gates are open either when a machine is switched on or they will not work.
FWIW I dabbled on and off with automated gates during the last couple of years ( I have a couple of prototypes in a box somewhere) and eventually realized that what I really needed rather than wanted much more than anything else was priority #3 and that I could achieve this with a $3 pressure sensor and an idea first proposed by MandJ see
https://www.woodworkforums.com/f200/s...ressure+sensor
Here are some examples:
https://www.woodworkforums.com/f200/d...ressure+sensor
I now absolutely have to have the right gates open on my main dust making machines; lathe, Band Saw, Belt sander and TS or they will not start.
This a made a major difference to general shed dust usually caused by those oft quoted statements;
"I'm just going to make this one cut so I won't turn on the DC.
Followed by
"Hang o,n I'll just cut this short one as well"
And
"One more"
Then
"Quick touch up on the sander "
ETC
I can bypass all my pressure switches if I need to but if I have to do that I have been pretty good at remembering to turn them back on when I finish.