Used in combination with a weathered timber upstand, this product provides a simple method for running a rectangular duct through a flat roof; simply drop through and fix as appropriate.
Duct dimensions, duct length and cravat size can be selected on the following pages. We recommend Doby frame connections, although it is possible to select slip joints if required.
Manufactured from 0.7mm galvanised steel.
Select a size from the drop down menu below that represents Dim A as depicted in the drawing to the right. Dim B can be selected on the following page.
Please use the 'Any other info' boxes to fine tune the size if necessary.