There are already 1" holes in the frame to accommodate some washers as spacers and a fender washer on the inside to sandwich the washers in the frame between that and the joist hangers. I doubled up on the joist hangars as with 5" Sch80 pvc it's a bit weighted and one hangar was a bit flimsy.
I did use 4" hangars on the end of the pipe toward the generator side and 6" on the opening end to give it some slope.
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USN - RETIRED NUKE
Taunton, MA
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