Considering 3 hot water boilers and heaters, what size should the grill be with 80% free air space?

To determine the appropriate grill size for ventilation with 80% free air space for three hot water boilers and heaters, it's essential to understand how the air intake requirements correlate with the size of the grill.

The calculation involves determining the total BTU output capacity of all the units combined and then referencing the required amount of free air intake per BTU, considering that 80% of the grill must be free air space to ensure adequate airflow for combustion and efficient operation.

Given the information provided, if the total required air space calculated based on the BTU input of the systems leads to a requirement of 275 square inches of grill area while accounting for the 80% free air space, then this is the correct size.

The 80% free air consideration is vital because it allows sufficient airflow to facilitate proper combustion and keep the equipment running safely and efficiently. A grill size that is too small may restrict airflow, potentially leading to unsafe operating conditions, whereas a properly sized grill ensures that the boilers and heaters have the necessary air supply for optimal function.

In summary, a grill size of 275 square inches, which meets the free air space standard, effectively supports the operational requirements of the hot water boilers and heaters while promoting safe and efficient operation