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Is It against the building code in IL to put a furnace in a crawlspace?

I am not familiar with building code, I am just viewed a home that had the furnace in the crawlspace.

Public Comments

1. I don't know about in IL because I live in NYC but as a fireman's daughter I would not want my furnace in a crawl space because if it blew up by accident it would surely cause a fire. In NYC furnaces and boilers have to be in a fire proof room so that if something happens there is a chance for the fire to be contained. I would be very surprised to find out that others states don't have similar laws.
2. It is not against the building codes as long as it is done properly.
3. That is not against code. If it is installed correctly, it is very smart and efficient to put the furnace below the floor. It also saves space.
4. As long as it is NOT a multliple dwelling (Some citys have fire codes for these type of blgs & would want it in a fire froof room plus have a smoke/ Fire detector. You should beable to put one in a private house. It also MUST have a Vent on the outside wall to let in fresh combustion air from the outside of the bldg.