A shelf mountable on vertical support members is made of a rectangular piece of sheet metal and is provided with truncated corners. A flange extends around the periphery of the shelf including the regions of the truncated corners to reinforce the shelf. Connector members are clamped to the flange at the truncated corners and are adapted for mounting on the vertical support members. Spaced parallel ribs substantially extend between one pair of opposing edges of the shelf and are parallel to the other pair of edges. A row of elongate rectangular apertures is provided between each pair of spaced parallel ribs. The rows have lengths substantially corresponding to those of the ribs. In this manner, objects placed on the ribs are maintained at a level above the surface of the shelf and air is permitted to pass through the apertures and circulate around the objects including along the supported surfaces thereof. The ribs reinforce the shelf in the regions weakened by the apertures.
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