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.
Missing Chimney Cap. The top of your chimney flue is a hole. Usually 8Ã8 for a furnace or 13Ã13 for a fireplace. Thatâs plenty of room for rain and snow to drop right down your chimney into your fireplace.