Chicago's yearly precipitation comes in at an average of about 36 inches (910 mm), but during the summer, rain arises from short-lived hit-or-miss rain rather than actual prolonged rainfalls, and thunderstorms also occur with regularity at night. In a normal summer, temperatures exceed 90 Â°F (32 Â°C) on 23 days.
You might have heard someone mention flue spaces for rack storage, and wondered what flue spaces are and why they are needed. Flue spaces are clear lines of sight from the floor up to the ceiling within rack storage areas. There are two types of flue spaces - transverse flues and longitudinal flues.
Best Answer: Open flue means that the appliance takes air out of the room and the exhaust gases get chucked out through a hole in the wall or a chimney. Flueless means it doesn't need any kind of flue.That normally only applies to very small catalytic heaters designed for caravans and greenhouses.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.