Apparatus having a printed circuit board assembly

An apparatus having a printed circuit board assembly, comprising:

• a housing having a front panel with an air suction portion, a rear panel with an air exhaust portion, a first side panel, a second side panel, a bottom panel and a top panel, and having an internal predetermined space;
• a printed circuit board assembly situated in the predetermined space and having at least a plurality of first printed circuit boards, a least one second printed circuit board, a fan, and a mother board, said first printed circuit boards being oriented in a predetermined direction and situated perpendicularly to the mother board, said fan disposed on the mother board separately from the first printed circuit boards, and said second printed circuit board being disposed on the mother board between the first printed circuit boards and the fan;
• a first air passage for feeding air substantially vertically within said predetermined space, said first air passage directing air from the air suction portion so that air passes between the first printed circuit boards and is exhausted from the air exhaust portion;
• and
• a second air passage for feeding air substantially horizontally within said predetermined space, said second air passage directing air from the air suction portion so that air passes along the second printed circuit board, passes through the fan, and exhausts from the air exhaust portion.

An apparatus having a printed circuit board assembly, comprising:

• a housing having a front panel with an air suction portion, a rear panel with a first air exhaust portion and a second air exhaust portion, a first side panel, a second side panel, a bottom panel and a top panel, and having an internal predetermined space;
• a printed circuit board assembly situated in the predetermined space and having a plurality of first printed circuit boards with non-high-heat-generating devices, at least one second printed circuit board with a high-heat-generating device, a high-temperature air exhaust fan, a mother board and a non-high-temperature air exhaust fan, said mother board situated within said predetermined space at a predetermined distance from the rear panel and in parallel to the rear panel, said first printed circuit boards being situated perpendicularly to the mother board at a predetermined distance in parallel to the first and second side panels, said high-temperature air exhaust fan disposed on the mother board separately from the first printed circuit boards, said second printed circuit board being disposed on the mother board between the first printed circuit boards and said high-temperature air exhaust fan, and said non-high-temperature air exhaust fan being situated near the second printed circuit board;
• a first air passage for feeding air substantially vertically within said predetermined space, said first air passage directing air from the air suction portion so that air passes between the first printed circuit boards and is exhausted from the first air exhaust portion through the non-high-temperature air exhaust fan;
• and
• a second air passage, provided with a sound absorption material, for feeding air substantially horizontally within said predetermined space, said second air passage directing air from the air suction portion so that air passes along the second printed circuit board, is drawn through the high-temperature air exhaust fan, and exhausts from the second air exhaust portion.