Which of the following common areas can bacteria grow on an HVAC system?

Bacteria can thrive in the drain pan and coils of an HVAC system because these areas often maintain moisture, which is essential for bacterial growth. The drain pan collects condensation that forms as the system cools the air, creating a warm, humid environment that is conducive to the proliferation of bacteria. Additionally, the coils can also accumulate dust and organic debris, providing a nutrient source for bacteria.

Maintaining cleanliness in these areas is crucial for preventing the spread of pathogens through the air circulated by the HVAC system, which can pose health risks to occupants in a building. Proper maintenance and regular cleaning routines help minimize the growth of bacteria, ensuring a healthier indoor environment.