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What's wrong with this picture? This is in our new-to-us place. The black tube from the wall is a vent. The sink howls when the wind blows. I have no idea why the vent is coming out of the wall but I believe at the very least it should go before the trap to vent everything else behind it...

I have a gas furnace (forced hot air) that was working fine a week ago. This week I noticed it wasn't blowing any hot air, in fact no air at all when the heat is on. I can hear the furnace fire up and run when I switch the thermostat to "heat on" but no warm air comes out. I thought the fan...