This Suburban 521099 12V DC 3G Fan Control Board is for the furnace and water heater fan ignition.

• 12 VDC
• Local Flame
• Works with all SF and NT Furnace models.
• Replaces Suburban 520820 & 232613.
• Replaces 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-34SP, NT-42T, SF-20, SF-20F, SF-25, SF-25F, SF-30, SF-30F, SF-35, SF-35F, SF-42, SF-42F, SF-42Q.
• Will Not Replace 24 Volt AC Boards
• Dimensions: 4-1/2" x 2-5/8".
• Cover is not included.