41. Mulching vacs are essentially power blowers with impellers ( blades ) that can chew up debris. 42. It also has the strongest impeller among robotic vacuum cleaners, pulling in 35CFM of air. 43. The coolant was expanded through the upper impeller where it lost pressure, boiled and cooled. 44. To work efficiently, there must be a close fit between the impeller and the housing. 45. An impeller in the tunnel can create thrust in either direction which makes the ship turn. 46. The 14-blade impeller and 19-blade compressor were both made of milled aluminum. 47. The rank badge for chief fire officers is an impeller between two ferns below two impellers. 48. The rank badge for chief fire officers is an impeller between two ferns below two impellers . 49. Bombardier Formula Jet Pump, with a stainless steel impeller pitched at 16 / 24 degrees. 50. Through processes such as cavitation, this is very bad for the impeller in the pump.
