A Rainbow is an extraordinarily well made machine, including the motor. The newest Rainbow doesn't use carbon brushes, which is why mine runs 24/7 in my bedroom to wash the air. Rexair (the manufacturer of the Rainbow) makes their own motor, it has an 8 year warranty. If you put the machine away with the water pan NOT latched onto the machine (I put it under the kitchen sink), you'll be fine.
My Rainbow never gets put away, always running extremely quietly on air wash speed. Rexair makes a germicide to go into the water, with alcohol and triethylene glycol as its main ingredients. With a capful in the water basin, the air returning to the room will be not only dust free, but bacteria free as well.
This is my 1939 Rainbow, along with my brand new one. Both have 100% suction, 100% of the time.
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