Hello The old Pellet Pro I or Pellet Pro II Harman stoves and VC Reliance pellet stoves have Exhaust or Combustion blowers that have 3 bolts to hold the motor on the exhaust housing. Therefore the only way to clean the blades and exhaust chamber is to remove the entire exhaust housing. This can be difficult. However I newer quick change housing can be cut and modified so a new Blower Harman, or any exhaust blower brand with a 6” round mounting hub can be easily installed! Don't forget to seal the new quick change housing to the inside of the Harman exhaust flange with High Temperature Silicone RTV, Pic 1 - Old Blower and housing Pic 2 - cutting the new quick change housing to fit. New housing has studs with nuts for easy exhaust blower installing and removal. See hole cut off with jig saw on right side Pic 3 - Mounting holes may also have to be elongated with a drill bit to align with holes Pic 4 & 5 - New 1.75 amp High Quality Exhaust Blower! Pic 6 & 7 - Harman Pellet Pro II
Since the CBs are not made anymore if you have one that works, it is worth some money$$$ The older Pellet Pro I has a Control Panel that looks like the old Earth wood pellet stoves!
The old 1993 Vermont Castings Reliance 2330 & 2340 pellet stoves have the same parts and can also use a newer quick change blower! https://woodburningdocuments.com/wp-content/uploads/2017/08/Vermont-Castings-Relian-ce.pdf See part 76 in exploded view below.