I think the crux he's up against is the closet is beneath or against a stairway inside a very tall house. There was only one flue installed when the house was built because of all the stair framing and its no longer accessible to add additional. If there are no openable windows above it a new flue could be run out the exterior wall. Here we require 2 combustion air make up vents, 1 within 12" of floor and one within 12" of ceiling. They should be free flowing with no dampers or flappers. I would chose life safety over using more gas in my pilot. The pilot adjustment should be in the main burner gas valve under a screw or plug
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