Patent ID: 8206821

Claim:
A conduit for conveying hygienically controlled air into a room, said conduit comprising at least one panel, wherein said panel includes an insulating material made of rigid foam positioned between at least two covering sheets, with one of said covering sheets facing an interior portion of said conduit, wherein said covering sheet facing said interior portion of said conduit is exposed to said hygienically controlled air passing through said conduit, and further wherein silver ions are present in said interior facing covering sheet, whereby bacteria contained in said hygienically controlled air passing through the conduit is destroyed due to antimicrobial properties of said silver ions, wherein silver ions are present by means of a finishing varnish of said interior facing covering sheet that includes a solution of said silver ions, wherein said finishing varnish is incorporated into said interior facing covering sheet, and wherein said interior facing covering sheet is in direct contact with said insulating material.