A fire stop spacer was installed at the first floor ceiling. Vent comes through the flooring of the 2nd floor near the corner of the house. Sheet metal was installed around the flue where the floor was removed. The joist run is completely open. No blocking installed. The wall is open except for the baseboard covering it. No blocking. Is this acceptable? This is a ballon frame house. ( And, by the way, 2 of the 2x10 joists are missing 10 inches--cut out by the installer) Another Duravent firestop spacer is at the ceiling of the 2nd floor. The flue then travels into the attic exiting the roof. No attic insulation shield installed. No sealant around the edges of the fire stop spacers so air leaks are present. the vent pipe penatrating the roof clears the rafter tie by 2 inches. According to the Duravent manual I downloaded, a minimum of 3 inches is required. Comments??