Viscoelasticity of Air

As I mentioned before, the suction power at vacuum tip end is not reduced or is increased if bypass air inlet way is opened adequately and the heat by the vacuum cleaner while running must be eliminated. This kind of mysterious phenomena was observed by actual trial experiments by myself.
Just remembered I the opinion by some factory engineer that the family use vacuum cleaner breaks soon if it is utilized for our professional use because of the moisture included in suctioned air.

But, according to my datum obtained after several experiments, the reason why the motor is easily destroyed is the Conduit Resistance of the duct arranged under the working space floor that is strong enough to indicator the dust-full mark at the top end in spite of empty holder box revealing that unnecessary stronger power for vacuum fan is no meaning and it invites over-heat on activating motor.
Making some bypass air way on somewhere of the duct that is near part of vacuum cleaner body and the bypass way hole should be adjusted on the most sweetest point, of course actual experiment by connecting a vacuum gauge at the end of vacuum tip portion and seek to find the amount of bypass air by adjusting bypass hole's diameter.

Remember here that the transition of the power of suction at end would not be direct proportion, but sometimes halls down and ups in exponential or ? Of course, there must be some special law and specific equation in the scientifically specialized field in relations with the friction between air molecules as a sticky  material and Reynolds coefficient. Though I'm afraid of obtaining the conclusion like this regarding the object difficult to understand and suspicious if being estimated well.