Final answer:
The maximum gas pressure allowed in a one- or two-family dwelling is typically around 0.5 PSI or 11 inches of water column.
Step-by-step explanation:
The maximum natural gas or propane gas pressure allowed inside a one- or two-family dwelling depends on various factors. In the United States, the typical gas pressure for residential buildings is around 0.5 PSI (pounds per square inch) or about 11 inches of water column. This pressure is regulated by the gas supplier or utility and is designed to ensure safe and efficient operation of the gas appliances in the dwelling.
It is important to note that the specific regulations regarding gas pressure can vary depending on the country or region. Therefore, it is best to consult local building codes or contact the gas supplier or utility for the most accurate and up-to-date information regarding maximum gas pressure allowances in residential dwellings.