Ive always heard the smallest size blower you should consider for a truck mount is a #4. Ain that true?
The operative words here are CFM, RPM. The operating RPM of the blower determines the CFM rating of the system. CFM is what actually moves the dirt and grime from the wand to the recovery tank. A #4 blower turning at 2400 RPM will not produce as much CFM as a #3 blower at 3700 RPM. Working CFM depends on how fast the manufacturer of the truck mount turns the blower in the machine. We’ve seen even larger blowers working at speeds that leave them operating well below their full potential. Careful investigation can leave the unambiguous conclusion that much of what you hear is little more than an ambiguous game played among manufacturers. Always keep in mind the role of balance. Unless you have or want the arms of a gorilla, you need a balanced system employing CFM and LIFT proportionally. CFM and LIFT have an inverse relationship. When lift is at it’s highest, the wand is locked onto the floor, and air moving through the vacuum hose, STOPS moving. When the wand is in the air, the lift is
