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Action Steps

Determine whether you need to follow Case 3 for natural ventilation systems. If natural ventilation serves 5% or more of your total occupied square footage, you have to follow Case 3. (You may also have to follow Case 1 or Case 2 in addition—check those r

Determine whether you need to follow Case 3 for natural ventilation systems. If natural ventilation serves 5% or more of your total occupied square footage, you have to follow Case 3. (You may also have to follow Case 1 or Case 2 in addition—check those requirements.) Rooms smaller than 150 ft2 are also exempt and should not be included in your calculations.