Ever notice there’s a subtle fold in the shape of an “x” in the middle of the sh...

		singleshot_ on July 27, 2023 \| parent \| context \| favorite \| on: Wavy walls use fewer bricks than a straight wall (... Ever notice there’s a subtle fold in the shape of an “x” in the middle of the sheet metal panels that make up ductwork? Undulations for rigidity are everywhere!