What is the minimum clearance for a draft hood relief opening from any surface other than what draft hood is connected to?

The minimum clearance for a draft hood relief opening is specified to be 6 inches from any surface other than the appliance to which the draft hood is connected. This requirement is in place to ensure that there is adequate space for the venting of combustion gases. Proper clearance helps prevent obstruction that can affect the performance of the appliance by ensuring that the flue gases can escape freely into the atmosphere.

When the draft hood relief opening is placed too close to surfaces, heat build-up and potential blockages can occur, which can lead to improper combustion ventilation. This clearance helps maintain the safety and efficiency of gas appliances, keeping both the appliance and the surrounding area safe from excessive heat and possible backdraft situations.