No before photos, but this was an upgrade from a 25 y/o draft Lennox to a new 94% Lennox furnace.
Kept existing AC in plenum, added two returns.
The only exterior wall that would work was 20 feet away.
The top block (in the background) was slightly below grade.
The intake is rotated to maintain 3 foot clearance from the gas meter.
The orphaned water heater, and capped off flue from the old furnace.