Patent No. 9 · Filed 6 December 1979

Plenum Construction

A method for casting concrete floor and ceiling plenums using collapsible formwork, removing the need for permanent shuttering and freeing up service routing.

Original Filing & Drawings

Plenum Construction — original document, page 1

Plenum Construction — original document, page 2

Plenum Construction — original document, page 3

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Floor Tile

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Air Conditioning Units