What minimum horizontal clearance is required between an operable window and an appliance vent termination?

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The minimum horizontal clearance required between an operable window and an appliance vent termination is four feet. This distance is established to ensure safety and proper ventilation. Vent termination refers to the point where exhaust gases from appliances, like furnaces or water heaters, are expelled outdoors. Having this clearance helps prevent the possibility of combustion gases entering the building through the open window, thus ensuring indoor air quality and safety for occupants.

Additionally, it addresses the risk of backdrafts, which can occur if windows are opened too close to a vent. By maintaining a distance of four feet, the likelihood of fumes entering living spaces is minimized, aligning with safety codes and best practices in mechanical systems.

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