Gas fired boilers not exceeding 100 square feet of heating surface must be equipped with which type of hood diverter?

For gas-fired boilers not exceeding 100 square feet of heating surface, the requirement for a hood diverter is specifically related to safety and efficiency. The correct choice, the single or double cone type diverter, is designed to effectively manage the flow of flue gases away from the combustion area.

The single or double cone type diverter helps in directing the exhaust gases more efficiently, minimizing the chances of back pressure and ensuring that the combustion process operates safely and effectively. This design helps in better dispersion of flue gases, which is crucial for maintaining optimal draft conditions in a gas-fired boiler.

In contrast, other types of diverters, such as flat, cylindrical, or rectangular types, may not provide the same level of efficiency or effectiveness in managing the flue gas flow. These designs could hamper the proper ventilation needed for the safe operation of the boiler. Hence, adherence to using the cone type diverter is critical as per industry standards and regulations governing boiler installations.