A visual on instant air shields:
I left my inputs on to check the frame data. In general, it takes 5f of a jump to be able to input something, so you'd add 5f to whatever the startup of said move is for the total number.
Startup:
Air down shield - 7f startup pointblank to 12f max range
Air straight shield - 12f startup pointblank to 15f midrange (have yet to check max range)
On block:
Air down shield is -17 from pointblank to -14 max range; MB version is +5 pointblank (have to check max range MB)
Air straight shield is -16 pointblank to -13 midrange; MB version at max range is +1
Other miscellaneous frame data:
Front dash is 21f total duration
Back dash is 36f total duration