Photo 1 of NON-FUNCTIONAL, PARTS ONLY-------------------------------Upgrade 520741 RV Furnace Control Circuit Board with fan Control Compatible with Suburban Furnace SA/SF/SFV/SH/NT series Replace 520820 521099 520871 for SF 20/25/30/35/42, NT 12/16/20/24/30/34

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Photo 1 of NON-FUNCTIONAL, PARTS ONLY-------------------------------Upgrade 520741 RV Furnace Control Circuit Board with fan Control Compatible with Suburban Furnace SA/SF/SFV/SH/NT series Replace 520820 521099 520871 for SF 20/25/30/35/42, NT 12/16/20/24/30/34Photo 2 of NON-FUNCTIONAL, PARTS ONLY-------------------------------Upgrade 520741 RV Furnace Control Circuit Board with fan Control Compatible with Suburban Furnace SA/SF/SFV/SH/NT series Replace 520820 521099 520871 for SF 20/25/30/35/42, NT 12/16/20/24/30/34