My newer gas fired heat/hot water system is side vented, and I've been pondering what's the best/right/legal option for decommissioning the flue.
This is a circa 1923 red brick chimney with two separate terra cotta lined flues, one for a (not-much-used but functional) wood burning fireplace, the other formerly used for a gas fired boiler & hot water heater, the latter of which is now not use. It's an air infiltration source, and it leaks a tiny bit rainwater into the basement in super-downpours, so I'm thinkin' I should probably do something with it at some point...
Can I just brick it up at the bottom and cap it a the top? (Plan-A)
Do I need to/want to fblow it full of rock wool (at least up to the roof line), since it's on an exterior wall, then brick & cap it? (Plan-B)
Should I just cap it & fuggedaboutit? (Plan-C)
Or should I do something else?