On the CRJ, there are four sets of spoiler panels, named from the inside out:
2 sets Ground Spoilers (Lift Dumpers)
Flight Spoilers (Speed Brakes)
Spoilerons
All four sets deploy on landing, but only the outer 2 sets are active in the air. Use of the word speedbrake is discouraged and "Flight Spoilers (FS)" encouraged.
Only limitation for FS use is Vref+17 kts and they have to be stowed by 300' AGL on approach. Blowback is a function of speed and hyd pressure and you can normally see about 5 degrees less than full (50 degrees) at 300KIAS with full FS selected. As speed bleeds off below 280KIAS, the FS indication is at full.