Given the equipment firing rates, what should be the grill size required for 3 Hot Water Boilers, 2 Hot Water Heaters, and 1 Domestic Hot Water Heater?

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Multiple Choice

Given the equipment firing rates, what should be the grill size required for 3 Hot Water Boilers, 2 Hot Water Heaters, and 1 Domestic Hot Water Heater?

The grill size is determined by the total combustion air needed for all gas-fired appliances in the space. You add up the firing rates (BTU per hour) of every appliance and convert that to opening area. The standard rule used is that for combustion-air openings, you need about 1 square inch of opening for every 1,000 BTU/h of total input. So, when you sum the three hot water boilers, the two hot water heaters, and the domestic hot water heater, you get a total of 275,000 BTU/h. Dividing by 1,000 gives 275 square inches of required grill area. That’s why the correct choice is 275 square inches.

The grill size is determined by the total combustion air needed for all gas-fired appliances in the space. You add up the firing rates (BTU per hour) of every appliance and convert that to opening area. The standard rule used is that for combustion-air openings, you need about 1 square inch of opening for every 1,000 BTU/h of total input. So, when you sum the three hot water boilers, the two hot water heaters, and the domestic hot water heater, you get a total of 275,000 BTU/h. Dividing by 1,000 gives 275 square inches of required grill area. That’s why the correct choice is 275 square inches.

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