Ok, I have been dealing with undersized gas lines in my area for many years now. I am frustrated with it. Our State Code says that you will size gas properly using the proper charts. What I am running into here is %80 of the homes are undersized. Most of the inspectors here are not requiring a sizing chart and the plumbers are undersizing. We have CSST and Black Iron pipe systems. If you bring 2lbs into a house and put a regulator up in the attic and then run a 1/2 csst line for 75 feet from the regulator to a 100,000 btu furnace. IT IS UNDERSIZED. There is an area here that has a lot of Patio covers and Arbors being built. They are adding gas grills when the arbor is built. The original plumber has stubbed out a 1/2" gas line on the back of the house. It is opposite corner of the gas meter. 126 feet to farthest outlet, gas line coming in is 1 1/4 (black iron pipe system) House already has a 450,000 but load on it. Wants to add a 75,000 btu grill and side burner. In this neighborhood, some plumbers just tie onto 1/2" stub and run from that. According to Charts neither scenario works. If you rob gas from something, it will cause improper combustion. The HVAC furnaces we have today are thin stainless steel. If you crack a heat exchanger, then you have carbon monoxide entering the home. If you have a new home and the carbon monoxide detectors are in the ceiling, then they may not detect the monoxide in time. This can lead to DEATH. I have had 3 carbon monoxide related cases in the last 2 years. Two of these situations someone almost died. In both cases, the carbon monoxide detectors did not go off. I am recommending to all my customers to plug a low to the ground carbon monoxide detector into a wall outlet that has a light on it, and check it often. What your thoughts on this article?