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.
Room sealed or balanced flue means that there's a hole in the wall that both draws in air and chucks out exhaust gases in a way that there's no connection with the air in the room.Modern boilers use this system. Source(s):old know all Â· 5 years ago.oom sealed or balanced flue means that there's a hole in the wall that both draws in air and chucks out exhaust gases in a way that there's no connection with the air in the room. Modern boilers use this system. Source(s): old know all Â· 5 years ago.