Dimensions of fresh-air vent

Categories: Building Code

NYC code says that a vent to the outside for an enclosed gas furnace must have an area of 144 sq. inches, or 12 by 12. Does this mean the louvre in the wall must be 12 x 12, or the duct running the length of a cellar must be 12 x 12? Or that from the furnace room to the outside there must be a minimum of 144 sq. inches? The vent I have is 26 inches circumference (or an area of 53 sq. inches) and runs 20 linear feet. Anyone have a clue?

By | 02/12/2009 12:44 AM