Abstract: The present invention relates to a central vacuum power unit comprising in combination a canister, a chamber for collecting debris, a first plate, a second plate, a third plate, a duct, a motor-fan assembly, a filter, and a first baffle. The duct extends between the first and second plates and is in fluid flow communication with respective openings defined in the first and second plates. The sidewall of the canister, the first and the second plates and the duct defines an acoustic damping chamber covered with a lining of sound absorbing material.

Abstract: The present invention relates to a central vacuum power unit comprising in combination a canister, a chamber for collecting debris, a first plate, a second plate, a third plate, a duct means, a motor-fan assembly, a filtering means, a first baffle means, means for generating a flow of cooling air for an electric motor, and means for reducing the emission of noise outside the canister. This central vacuum power unit is characterized in that a portion of said piping passes across a further opening is provided in the plate which is provided with the seat of resilient vibration dampening material and is receiving the motor-fan assembly, in that said portion of piping has a vertical axis substantially parallel to the axis of the intake of the vacuum fan, so that any deformation of the seat due to the vacuum existing underneath the motor-fan assembly will allow the piping to slide freely in said further opening without solid contact with said plate.