Importance

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Abstract

A vent opening for a portable building wall forming panel made of a thin, plastic sheet is formed by a series of aligned, roughly rectangular shaped, box-like depressions in the sheet to provide a series of depressed longitudinal and end walls which are integral with the panel and the respective bases of the depressions. A series of aligned openings are formed by cutting away the depression end walls and the bases, except for narrow base portion strips at the longitudinal walls. This provides longitudinal flanges that are integral with the panel and with their free edges terminating in integral flange strips which are substantially in the same plane. The junctures of the longitudinal walls with their adjacent panel portions, which define the openings, form an acute angle. The junctions between the free edges of the longitudinal walls and their flange edge strips also form an acute angle and consequently, provide opposing channels in each opening, with the channels being longitudinally aligned along the series of openings. A stiff, foraminous sheet is slid endwise between the opposed flanges and the sheet edges are held within the channels and against the strips formed of the panel portions located between adjacent openings.

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First Claim