Final answer:
Air purging from residential piping systems must adhere to local plumbing codes, ensuring safety and regulatory compliance. Manufacturer's instructions and principles of entrainment, like in a Bunsen burner, play a role in proper appliance function. Plumbing systems use specific devices to address air management.
Step-by-step explanation:
When purging air from residential piping systems without a readily accessible open burner on an appliance with an input of 400,000 Btuh or less, it should be done in accordance with local plumbing codes. The correct answer is (c) Local plumbing codes. This ensures the safety and compliance with regional regulations and standards. It's essential to remember the importance of adequate ventilation and to follow the manufacturer's instructions for the use of appliances that could release pollutants into the indoor air, as improper purging can lead to hazardous situations. Devices such as Bunsen burners exemplify the principle of entrainment, where air is drawn in for proper combustion. Plumbing systems also integrate air-filled tubes to prevent water hammer and ensure proper function, illustrating the care taken to mitigate air-related issues in plumbing and ventilation applications.