Attributes . Compatibility: Atwood Hydroflame Furnaces Without Exterior Door, 8516-IV, 8520-IV, 8525-IV, 8531-IV, 8535-IV, 1522 2 STAGE, 2334 2 STAGE, 8935-III DC, 8940-III DC, 8935-III AC, and 8940-III AC units. . Names