Arrangement in cooling circuit boards

Claim 1

Apparatus comprising a cabinet, a plurality of magazines supported in said cabinet in vertically spaced relation one above the other, a plurality of circuit boards supported in each magazine in spaced horizontal relation adjacent to one another such that air flow through the magazines between adjacent boards, and a plate supported in said cabinet above each magazine and through which the air flows after traversing the respective magazine, each plate being provided with rows of aperture means, each row constituted by a plurality of orifices or a slot, said rows extending parallel to said circuit boards and having a spacing corresponding to the spacing of said boards such that each row is disposed above a respective board in opposition thereto, each board generating a respective amount of heat which may differ from that of the other boards, said aperture means in each row being of a size related to the respective amount of heat generated by each board such that the sizes of the aperture means in the different rows may differ from one another to cause the air flow through the rows at the aperture means in each plate to be adjusted to the heat generation in each board.