Today Elden returned to Peter's home to redo a missed return vent Upon arrival operation of furnace was confirmed and then shutdown. Drop cloths were prepared for hyper vac and then connected to the return side of the furnace. Missed return vent was then cleaned thoroughly to the Clearview standard and return run was air raked to clear of all debris and dust. Finally the site was cleaned of all tools and supplies and left just as I found it.