What is the minimum height a combustion air intake opening must be located above contaminant sources?

The minimum height for a combustion air intake opening is established to prevent contaminants from interfering with the combustion process. By placing the intake at least 3 feet above potential contaminant sources, such as exhaust vents or any source that may emit gas, smoke, or other pollutants, the risk of these pollutants entering the combustion system is minimized.

This requirement is vital for maintaining efficient combustion and ensuring safety in HVAC systems. Placing the intake effectively limits the likelihood of air quality issues, which can lead to performance problems or even pose health risks. Understanding and adhering to these clearances helps ensure that the combustion air is clean and suitable for proper equipment operation, as adequate ventilation is crucial in residential and commercial settings.