Gas water heaters or appliances connected to a common vent must be located a minimum of how far from a wall?

The minimum distance that gas water heaters or appliances connected to a common vent must be located from a wall is 12 inches. This requirement is in place to ensure safe air circulation around the appliance, which is crucial for proper combustion and to prevent the risk of fire hazards. Adequate spacing allows for maintenance access and minimizes the chance of objects or materials being placed too closely to the heat source, which could pose a danger.

The regulation ensures that the appliances have sufficient room for ventilation, further enhancing safety by helping to prevent carbon monoxide buildup that could occur if the venting system doesn't function properly. This standard distance also helps in maintaining the integrity of the venting system and its effectiveness, thereby ensuring compliance with building codes and safety regulations.