Standard features of the Spirit Series Oil Furnaces include a heavy-gauge drum-style heat exchanger and ceramic fiber combustion chamber, which serves to greatly reduce the combustion noise associated with expansion and contraction. This design heats up quickly, re-radiates heat back into the fire providing more complete combustion and cools down quickly after the burner is called to stop. The VH8 is built with a heavy duty 22-gauge powder coated cabinet for a durable, tough finish that will ensure long life and a quality appearance. The full cabinet foil-faced high density fiberglass insulation reduces heat loss and sound levels.