Patent ID: 7406744

Claim:
A central vacuum system for reducing the pressure of air to less than that of an ambient atmosphere that contains contaminants, the system comprising: a canister for installation at a substantially fixed location; a divider system disposed within the canister to help define within the canister a suction chamber, a motor chamber, a plenum, and an electrical chamber; a motor extending into the motor chamber, wherein the motor heats the air therein; a main impeller coupled to the motor to help create a suction pressure within the suction chamber; a secondary impeller coupled to the motor, wherein the secondary impeller forces air from the ambient atmosphere into the electrical chamber, forces air from the electrical chamber into the plenum, forces air from the plenum into the motor chamber, and forces air from the motor chamber to the ambient atmosphere; and a motor drive component disposed within the electrical chamber and being electrically coupled to the motor, wherein the air forced through the electrical chamber helps cool the motor drive component.