Check the listing for details. Suburban 520820 RV Furnace Heater Fan Control Ignition Circuit Board OEM BOARD. Condition: New. Listed at 99.90 USD. ORIGINAL BOARD Suburban Furnace 521099 12V DC 3G Fan Control Board Replaces Suburban 520820. Suburban Circuit Board Fan Control Ignition Control Module (Cover Not Included) works of the following models: DD-17-DSI, NT-12S, NT-12SE, NT-16S, NT-20S, NT-16SE, NT-20SE, NT-24S, NT-24SP, NT-24M, NT-25K, NT-30SP, NT-34S, NT-42T, SF-20, SF-20F, SF-25, SF-25F, SF-30, SF-30F, SF-35, SF-35F, SF-42, SF-42F. Will not work on NT-45S model. **Will not replace 24VAC model boards.** SAME DAY SHIPPING ON ORDERS PLACE BEFORE 2:00PM EASTERN TIME Next day air shipping for Saturday delivery note to all buyers:All orders placed on Fridays will arrive the following Monday/Tuesday depending on location orholiday schedule.Ebay does not provide that shipping option. Thank you for your business 24/7 Parts