An interlock switch prevents furnace operation if the inner blower door is not in place. (with the option of a field 3 Vent and combustion air diameters may vary depending upon vent length.
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® brand GMH95 Gas Furnace may be your best option. Furnace, including the multi-speed blower and two-stage gas valve, Vent Blower • Electronic Control Board with Self-Diagnostics • Auto-Comfort Mode for Enhanced Dehumidification