What is the required size of openings between a 1344 ft³ mechanical room and a 4800 ft³ mechanical room for a 110,000 BTU/h?

To determine the required size of openings between two mechanical rooms for a specific BTU rating, one must consider the necessary airflow for maintaining proper ventilation and reducing the risk of overheating. In this case, the total BTU demand is 110,000 BTU/h.

Airflow requirements are typically derived based on the BTU input. A general rule of thumb for mechanical rooms is to provide enough openings to ensure that for every 1,000 BTU/hour of equipment load, there should be approximately 1 square inch of free area for airflow. When calculating the total required opening size for this scenario, you would take the total BTU input and divide by 1,000 to determine the necessary square inches of opening.

With 110,000 BTU/h, the calculation would be:

110,000 BTU/h ÷ 1,000 BTU/in.² = 110 in.²

This calculation aligns directly with the choice indicating 110 square inches as the required opening size. Ensuring that this ventilation is in place is crucial for efficient operation and safety, preventing excess heat accumulation in mechanical spaces, which could lead to equipment failure or fire hazards. Hence, the correct opening size that meets these requirements is 110 square inches.