What is the maximum input in BTU/hr for an unlisted decorative appliance in a vented fireplace with specific chimney and opening area?

The maximum input for an unlisted decorative appliance in a vented fireplace is determined by safety codes that take into account the size of the fireplace opening and the chimney specifications. For any decorative gas appliance, adherence to these codes is essential to ensure proper ventilation and minimize the risk of hazardous gas accumulation.

In this context, the figure of 50,400 BTU/hr aligns with industry guidelines set forth in national standards, which often specify limits based on the dimensions of the venting system. These guidelines ensure that even if the appliance is not listed for a specific application, it can still operate safely within a certain threshold.

This limit serves to prevent overheating and promotes efficient combustion, protecting both the appliance and the occupants of the home. The choice of 50,400 BTU reflects the intersection of adequate performance without exceeding safety standards for this type of installation.