For natural gas, what is the maximum allowable inlet gas pressure?

The maximum allowable inlet gas pressure for natural gas appliances typically falls within the range specified in option C, which is 13.5 - 14.0 inches of water column (in. w.c.). This range is set to ensure the safe and efficient operation of gas appliances, as pressures above this level can lead to issues such as improper combustion, potentially creating a fire hazard or producing harmful carbon monoxide.

Natural gas appliances are designed to handle specific pressure ranges to function optimally. Operating at the correct pressure ensures that the gas flow is adequate for proper combustion, which is crucial for maintaining efficiency and safety. Pressures that exceed the recommended levels can lead to an increased risk of gas leaks and appliance malfunction.

Understanding these specifications is vital for HVAC technicians, as they need to verify that gas pressures are within the allowable range during service and maintenance tasks. Regular checks and adjustments based on manufacturer guidelines help in maintaining compliance with safety regulations and ensuring the longevity of the appliances.