with spacers made of the same material as the heat-exchange medium. One air stream passes through the corrugated channels in the interior of the sheets, while the other passes between the exterior layers of the stacked sheets.

Recycling

Corrugated plastic is usually made from polypropylene which is capable of being recycled. Resin identification code 5 applies: the number 5 surrounded by a recycling symbol, with the letters "P P" below.

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