Suburban | Replacement Furnace Core for SF-20F/SF-20FQ | 2606A | RP-20FQRestore your Suburban RV furnace to factory operation without the hassle of replacing the whole unit using the Suburban Replacement Furnace Core (Part #2606A Model RP 20FQ). Instead of removing and repairing individual furnace components, simply slide this complete core module into your existing cabinet getting you back to reliable heat with significantly less labor and cost than a full furnace replacement. Why Replace the Core Instead of the Whole