Is it true that a fuel oil burner rated at 1.25 GPH requires 175 square inches of free area for its combustion air openings?

A fuel oil burner rated at 1.25 gallons per hour (GPH) indeed requires a specific amount of combustion air to operate efficiently and safely. The general guideline is that for every 1,000 BTUs of input to the burner, approximately 0.35 square feet or 50 square inches of free area is needed for combustion air openings.

In this case, a 1.25 GPH fuel oil burner has a corresponding BTU input; when this input is calculated, it aligns with a requirement of around 175 square inches of free area for combustion air openings. This amount of free area allows the burner to receive the necessary air for proper combustion, preventing issues like incomplete combustion, which can lead to safety hazards and inefficiencies.

Understanding the importance of proper combustion air supply highlights why such specifications are crucial in HVAC installations. This ensures adherence to safety regulations and optimal performance of heating equipment.