SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

It may rest on the soil if a plastic vapor barrier is used It shall not contact the surrounding soil; sides of the pit shall be held back not less than 12 inches; and if the pit is more than 12 inches below adjoining grade the walls shall be lined with concrete or masonry extending not less than 4 inches above grade A 6-inch gravel bed is the only required protection Pits are prohibited for all listed heating appliances