This DC Furnace Circuit Universal Ignition Control Board with Direct Spark Ignition is the OEM replacement part specifically designed for use with Atwood Hydro Flame Furnaces: 7912-II, 7916-II, 7920-II, 8012-II, FA 79D, HF 80D, DC82 25-32, DC82 35-41, FA 76D, FA 78 25-32, FA 72D, 85-I Series, 85-II Series, 8500-III Series, 8500-IV Series , 8900-I DC Series, 8900-II DC Series, 8900-III DC Series, AFSD12, AFSD16, AFSD20, AFMD20, AFMD25, AFMD30, AFMD35, DFMD20111, DFMD30111, DFMD25111, DFMD35111 DFSD12111, DFSD16111 and DFSD20111. The ignition control board performs all the functions necessary to turn the furnace on and keep it running. The board sends signals to open the gas valve and emits a high output voltage that creates an ignition spark to light the burner. World Class Technology Designed for Atwood Furnaces Series 79/80XX, 85XX, & 89XX | Dometic Universal Ignition DC Furnace Control Board, DSI