Based on my research I have found a few options for automated blast gates. There may be more, if so, please link.
1. Pneumatic linear - pnuematic cylinder to open a linear slide gate (us-duct)
2. Motor driven linear leadscrew - similar to pnuematic linear using a leadscrew instead of cylinder rod (sorry, I couldn't find a mfr)
3. Motor driven linear rack and pinon - use a motor to drive a rank and pinon gear setup to move the gate (iVac)
4. Motor driven swing gate rack and pinon - use a motor to drive a a rack an pinon on a gate the rocks from a pivot point oppposite the motor (ecogate and grngate)
I can and plan to build my own. The manufacturers listed are only for reference (sorry, pictures not working, don't know why).
Both the pnuematic and motor leadscrew have options of inline with the gate (us-duct ro nordfab) or on the side of the gate (nordfab, has both options)
I am trying to decide on the design and drive I'm about to delve into. Being a EE I am leaning towards the motor driven and away from the pneumatic (easier to find a broken wire than a leaking airline ).
Which design did you use or do you prefer? Which design should I avoid?