Items and costs (as of 2026-05-03T10-13) (click any photo to zoom in in a new tab, which can be closed after viewing, and you’ll return to this page):

Flexmaster TYPE 8M R6 flex duct, insulated, 56″ long:

Duct boot. Stainless steel; 30G; custom built. Reduces: 8″ round to 14″ x 8″ rectangular; 16-1/2″ long (not including collar):

Design for sound reducing ‘box’ used with duct boot (box not included):

Mason Industries Super W pads, acoustic dampeners for wallboard, duct seal, putty pad: