207 may include an agitator to aid in dislodging the rock dust or other aggregate from the surface of the mass air distributor 201 in the configuration of fig2 this agitator causes vibration as air from the air expansion chamber 205 passes through an air powered agitator 202 attached to the mass air distributor 201 operationally the pressurized air 170 is introduced through the inlet port 206 and enters the air expansion chamber 205 the pressurized air then passes through the mass air distributor 201 through the intake ports 204 and air flow orifices 203 air also passes through the air powered agitator 202 which is used to facilitate the mixing of the air and rock dust the air stream which is now in a vortex motion created by the mass air distributor 201 mixes with the dust or aggregate and rises up to the top of tank 207 this rising mixture is then captured by the air directing plate 211 which directs the mixed air and rock dust through the outlet 210 for distribution fig4 and 5 show a rock dusting system according to another exemplary embodiment of the present invention this air supply system is shown in combination with the exemplary embodiment of fig2 but can also be applied to the exemplary embodiment of fig1 the regenerative blower and tank assembly of fig4 shows regenerative blower 221 coupled to a sealable tank 207 using an inlet port 206 the air supply system includes an inlet filter 222 disposed on the inlet port 216 of the regenerative blower 221 an outlet relief value 223 is disposed on the outlet port 217 of regenerative blower 221 to prevent excessive back pressure from damaging the regenerative blower 221 a hose 224 transfers the pressurized air from the regenerative blower 221 to.