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In the old days, none of us had to worry about ventilation. Radiator heating was fine all by itself in ourdrafty old houses, which got plenty of fresh air from the wind that blew in around the windows and through the walls. When the new air-tight homes first showed up on the Canadian prairies, almost all of them had "forced-air furnaces—so cutting off the wind from blowing through the house didn't cause many problems. The furnace fan kept the air moving. But when we built energy-efficient houses with electric baseboard heating, here's what we did: First we eliminated the chimney, which previously had served as a 24-hour-a-day exhaust fan to draw bad air out of the house. Next