Image 1 of 2 Image 2 of 2 Comfort-Aire GUH/GDD80C Series Gas Furnace $0.00 ConfigurationsUpflow / Horizontal GUH-SeriesDownflow GDD-SeriesHeat ExchangerAluminized steel tapered crimped non-welded clam shell designBurnersAluminized steel inshot burners for smooth ignitionCabinet DesignCompact 33” heightStandardized widths for easy coil fit Air Delivery SystemMulti-speed high efficiency (constant torque) blower motorControls Single stage gas valveDurable silicon nitride ignitorSelf diagnostics saving last 10 fault codes regardless of power interruptionVenting Rotatable draft inducer for venting flexibilityClick HERE for a detailed spec sheet. Added! ConfigurationsUpflow / Horizontal GUH-SeriesDownflow GDD-SeriesHeat ExchangerAluminized steel tapered crimped non-welded clam shell designBurnersAluminized steel inshot burners for smooth ignitionCabinet DesignCompact 33” heightStandardized widths for easy coil fit Air Delivery SystemMulti-speed high efficiency (constant torque) blower motorControls Single stage gas valveDurable silicon nitride ignitorSelf diagnostics saving last 10 fault codes regardless of power interruptionVenting Rotatable draft inducer for venting flexibilityClick HERE for a detailed spec sheet.