February 14, 2018
April 6, 2015
The section being referenced is in the 2012 and 2015 IMC.
Gas water heater "exhaust" is not environmental air. See the definition for environmental air in Chapter 2 of the IMC.
Reading between the lines, I think the question concerns the venting of "condensing-type" gas water heaters because of the statement: "It's just CO2."
Because the appliance is a fuel gas-fired appliance, the International Fuel Gas Code applies to the installation. The IMC does not cover gas appliance installations.
As these types of water heaters are usually direct vent appliances (specifically, a Category IV direct vent appliance), Section 503.2.3 applies. That section indicates that the installation must comply with the manufacturer's installation instructions and Section 503.8, Item 3.
Note that where the vent for a Category IV direct vent appliance is "through the wall", the termination is also subject to Section 503.8, Item 4.
September 30, 2016
yes, 501.3.1 #2 is the answer for the engineer. Remember the Apollo 13 movie and the co2 issue? its not explosive/flammable, and its not environmental.
April 7, 2015
I have a question.
I have a hotel that wants to exhaust gas water heaters to the outside, 3 feet below the room above which has an in wall heater/ac unit and an openable window.
The hotels mechanical engineer does not think "clean CO2" is noxious, what say you?
I believe it falls under IMC 501
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