A mechanical drive system comprising: a mechanical drive component, the mechanical drive component having a housing and a first rotatable shaft supported within the housing, the housing having a first end surface, a second end surface, a pair of spaced apart side surfaces extending between the first and second end surfaces (14; 15), and an upper surface extending between the first and second end surfaces (14; 15); an enclosure disposed on the housing, the enclosure having a first end wall, a second end wall, a pair of spaced apart sidewalls extending between the first and second end walls (36; 57), and an upper wall extending between the first and second end walls (36; 57), wherein the pair of spaced apart sidewalls and the upper wall form a cover that is generally U-shaped, the second end wall having an output opening therein through which the first rotatable shaft of the mechanical drive component extends, the first end wall having an intake opening therein, the first and second end surfaces (14;15), the pair of spaced apart side surfaces, and the upper surface of the housing of the mechanical drive component, along with the pair of spaced apart sidewalls and the upper wall of the enclosure defining between them an air passage channel extending from the intake opening to the output opening; a centrifugal fan having a rotatable impeller aligned and in fluid communication with the output opening of the enclosure, the first rotatable shaft being operatively connected to the impeller, characterized by a plurality of heat dissipation fins mounted on the pair of spaced apart side surfaces and the upper surface of the housing, each of the plurality of fins having a flat rectangular shape that is aligned with a direction of airflow through the air passage channel, the plurality of fins extending within and entirely across the air passage channel so that outer ends of the fins are positioned in close proximity to the cover; and the centrifugal fan operating to create a negative pressure or vacuum adjacent the output opening so that air is drawn through the input opening, through the air passage channel and over the plurality of heat dissipation fins, and exit through the output opening. a mechanical drive component, the mechanical drive component having a housing and a first rotatable shaft supported within the housing, the housing having a first end surface, a second end surface, a pair of spaced apart side surfaces extending between the first and second end surfaces (14; 15), and an upper surface extending between the first and second end surfaces (14; 15); an enclosure disposed on the housing, the enclosure having a first end wall, a second end wall, a pair of spaced apart sidewalls extending between the first and second end walls (36; 57), and an upper wall extending between the first and second end walls (36; 57), wherein the pair of spaced apart sidewalls and the upper wall form a cover that is generally U-shaped, the second end wall having an output opening therein through which the first rotatable shaft of the mechanical drive component extends, the first end wall having an intake opening therein, the first and second end surfaces (14;15), the pair of spaced apart side surfaces, and the upper surface of the housing of the mechanical drive component, along with the pair of spaced apart sidewalls and the upper wall of the enclosure defining between them an air passage channel extending from the intake opening to the output opening; a centrifugal fan having a rotatable impeller aligned and in fluid communication with the output opening of the enclosure, the first rotatable shaft being operatively connected to the impeller, characterized by a plurality of heat dissipation fins mounted on the pair of spaced apart side surfaces and the upper surface of the housing, each of the plurality of fins having a flat rectangular shape that is aligned with a direction of airflow through the air passage channel, the plurality of fins extending within and entirely across the air passage channel so that outer ends of the fins are positioned in close proximity to the cover; and the centrifugal fan operating to create a negative pressure or vacuum adjacent the output opening so that air is drawn through the input opening, through the air passage channel and over the plurality of heat dissipation fins, and exit through the output opening.