What is the minimum height of a main vent from the nearest connected appliance?

The minimum height of a main vent from the nearest connected appliance is defined to ensure the proper functioning of the venting system and to prevent interference with the appliance's operation. Keeping it at least 5 feet above the highest connected appliance helps to minimize the potential for backdrafts, where combustion gases could re-enter the appliance instead of being expelled outside. This height also assists in adequately dispersing gases and ensuring that they do not interfere with the combustion process. Furthermore, following this guideline helps maintain safety standards, reducing the risk of hazardous situations associated with improper vent setups.