Although Chicago is known as the Windy City, it is in fact less windy than many other major American cities. Average wind speeds range from 8 miles per hour (13 km/h) in late summer to 12 miles per hour (19 km/h) in spring months.
A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors.
A fireplace damper is important for several reasons. First, while the fireplace is not in use, the damper should be closed to prevent cold outside air from entering through the flue and into the house. This helps create energy efficiency. Second, the damper should be completely open while starting a fire to prevent smoke from filling the home.