Need 12" vertical rise before any offsets
6" clearance off that draft hood and single walled pipe so the insulation goes
Need draft hood connector to transition from single walled to b-vent
need proper support
cannot penetrate ceiling with single walled pipe
cannot penetrate listed firestop with elbow of any kind
need attic insulation shield
cannot have single walled vent in attic--must be B-vent . Not that it can remain there but that single walled pipe would need a 6" clearanec to those joists.
Don't see any screws securing the single walled pipe anywhere
Do you meet clearances in this closet? Looks pretty tight
How about make up air? Is this open to the room?
Is there a shutoff on the water line? Bonding?

Hate to ask what the vent looks like going through the attic and roof, the gas piping or TPR. Looks like Harry Homeowner got his stuff from the Big Orange Box....

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disgusted with some people on this forum. Out of here!