Final answer:
Local building codes, national standards, or installation instructions typically determine how far a vent should terminate from a window. For many appliances, a common requirement is a minimum of 12 inches to prevent flue gases from entering, but this cannot be definitively confirmed for the 65,000 BTU appliance without specific code or manufacturer references.
Step-by-step explanation:
The question relates to the installation requirements for a vent from a heating appliance, specifically concerning its proximity to a window. While the question provides an appliance firing rate of 65,000 BTU, there's insufficient information regarding the exact codes or standards that apply, as these can vary by location and specific appliance type. Typically, such distances are determined by local building codes, national standards, or the installation instructions provided by the manufacturer of the appliance. Commonly, ventilation should terminate at a distance sufficient to prevent flue gases from entering the building, which for some devices could be at least 12 inches from any opening into the building, including windows, doors, and ventilation intakes. However, without specific guidelines or standards being referenced, it's not possible to provide a definitive answer to the multiple-choice options provided: A. 6", B. 10", C. 12", or D. 36".