Two stages of operation to save energy and maintain optimal comfort level. Furnace operates at 70% capacity for low-heat and 100% capacity for high-heat. Compatible with single or two-stage thermostat. (For optimal performance a two-stage thermostat is recommended.) Heat Exchanger is constructed of all stainless steel for maximum corrosion resistance and thermal fatigue reliability. Low profile "34 inch" design is lighter and easier to handle and leaves room for optional accessories. Left or right side gas, electric, and condensate drainage Connections. Integrated control board manages all operational functions and provides hookups for humidifier and electronic air cleaner. An insulated blower compartment, a slow-opening gas valve and a specially designed inducer system make it one of the quietest furnaces on the market today. Variable speed blower motor technology provides ultimate humidity control, quieter sound levels and year-round energy savings. Optional indoor or outdoor combustion air. In addition, combustion air may be piped to either the top or side of the cabinet on all up flow models. A special molded fitting is provided to ease installation. Solid bottom is standard. Control board diagnostics.  A variety of cooling coils and plenums designed to use with the Ruud Classic® Series 95% A.F.U.E. gas furnaces are available as optional accessories for air conditioning models.

Adjustment-Free In-Shot Burners. The natural (or optional LP) gas is ignited by the direct spark ignition at the in-shot burners.  The in-shot burner's shutter-free design requires no adjustments to regulate the air/gas mixture. Efficient Primary & Secondary Heat Exchanger. The Ruud Classic® 90 Plus® heat exchanger is renowned for its dependability and efficiency. It's constructed of aluminized and stainless steel for maximum resistance to rust and corrosion. And it's backed by a limited lifetime warranty. Slide-Out Blower. Thanks to adjustable controls for the blower, your technician can precisely match airflow to the specific comfort requirements of your home. Easy To Access and Clean Filter. The Ruud Classic® 90 Plus® is equipped with a permanent, washable filter that's easy to access and clean. You won't ever have to deal with the hassle and expense of replacement filters. Efficient Direct Spark Ignition. Direct spark ignition is an extremely dependable and efficient way to light the burner. And it eliminates the need for a standing pilot. For added safety, the remote flame sensor constantly monitors the burner flame to ensure it is operating as it should. Slow-Open Gas Valve. The redundant gas valve is a 24-volt slow-opening valve that delivers gas in a regulated flow to the patented "in-shot" burners. Quiet Draft Inducer. This draft inducer, which was specifically designed for the 90 Plus® up flow gas furnace, quietly provides air for combustion while simultaneously venting outdoors the products of combustion from the furnace heat exchanger. Integrated Furnace Control with Standardized On-Board Diagnostics. The "Brain" of the Ruud Classic® 90 Plus® is the Integrated Furnace Control (IFC) which directs all activities of major furnace components. The control features low-speed continuous fan operation and accessory terminals

The Ruud Classic Series with Dual Comfort Control two-stage gas furnace features a new two-stage gas valve that delivers fuel to the burner at 1 of 2 rates to maintain the desired temperature. On the coldest days, the furnace will operate at 100-percent capacity. On other days, the furnace operates at 70-percent capacity to help reduce energy bills. This means that now you can have the best of both worlds. Economical light-duty heating on cool days, and real heavy-duty heating power on the coldest nights. All that, and the energy savings of a 90-percent gas furnace make the Ruud Classic Series with Dual Comfort Control a perfect choice.SAVINGS ON TAX DAY While purchasing an RGRL gas furnace can help lower your heating bill for years to come, it can also help lower your burden on tax day! The Internal Revenue Service (IRS) is now providing Consumers with a tax credit on high-efficiency heating and cooling equipment. This type of tax credit can provide you with significant savings by reducing the amount of income tax you have to pay. HEAT EXCHANGER Awarded three patents, the heat exchanger is renowned for its Reliability and efficiency. It's constructed of aluminized and stainless steel for maximum resistance to rust and corrosion.GAS VALVE With the call for ignition, the integrated furnace control then opens the gas valve. The redundant gas valve is a 24 volt slow-opening valve that delivers gas in a regulated flow to the in-shot burners.IN-SHOT BURNERS The natural (or optional LP) gas is ignited by the direct spark ignition at the in-shot burners. The in-shot burner's shutter free design requires no adjustments to regulate the air/gas mixture. DIRECT SPARK IGNITION Direct spark ignition is an extremely Reliable and efficient way to light the burner. And it eliminates the need for a standing pilot. For added safety, the remote flame sensor constantly monitors the burner flame to ensure it is operating as it should. ADJUSTABLE AIR SPEED Thanks to adjustable controls for the blower, your technician can precisely match airflow to the specific comfort requirements of your home. INTEGRATED FURNACE CNTROL
The "Brain" of the Ruud Classic Series with Dual Comfort Control is the Integrated Furnace Control (IFC) which directs all activities of major furnace components.

10-Year Conditional Parts Warranty, Limited Lifetime Heat Exchanger Warranty, plus a Conditional Limited Lifetime Unit Replacement Warranty, (registration required), Variable Speed High Efficiency Motor with Contour Comfort Control ® that operates from 40% to 100% of total capacity, Efficiency Rating of up to 94.8 A.FU.E, Compact size for installation flexibility.

Heat exchanger is constructed of all stainless steel for maximum corrosion resistance and thermal fatigue reliability. Modulating Function: when used with a modulating thermostat, modulation rate between 40% and 100% of total capacity. Two-stage Function: when used with a two-stage thermostat, furnace operates at 40% on first stage, and stages up to 65%, then 100% for second stage. Multistage Function: when used with a single-stage thermostat, furnace functions as a three stage furnace operating at 40%, 65% and 100% of total capacity.

Reduced firing rates, electrically efficient ECM2+ motor, and solid doors provide the ultimate in quiet operation. Low speed constant fan. Constant temperature rise for superior comfort. Seven segment LED for system diagnostics. Diagnostic history for troubleshooting.

Two-speed induced draft motor. Direct spark ignition with remote sense. Top electrical connections. Optional indoor or outdoor combustion air.A variety of cooling coils and plenums designed to use with the Ruud Prestige Series T 90 Plus gas furnaces are available as optional accessories.

10-Year Conditional Parts Warranty, Limited Lifetime Heat Exchanger Warranty, plus a Conditional Limited Lifetime Unit Replacement Warranty, (registration required), Variable Speed High Efficiency Motor with Contour Comfort Control ® that operates from 40% to 100% of total capacity, Efficiency Rating of up to 94.8 A.FU.E, Compact size for installation flexibility.

Heat exchanger is constructed of all stainless steel for maximum corrosion resistance and thermal fatigue reliability. Modulating Function: when used with a modulating thermostat, modulation rate between 40% and 100% of total capacity. Two-stage Function: when used with a two-stage thermostat, furnace operates at 40% on first stage, and stages up to 65%, then 100% for second stage. Multistage Function: when used with a single-stage thermostat, furnace functions as a three stage furnace operating at 40%, 65% and 100% of total capacity.

Reduced firing rates, electrically efficient ECM2+ motor, and solid doors provide the ultimate in quiet operation. Low speed constant fan. Constant temperature rise for superior comfort. Seven segment LED for system diagnostics. Diagnostic history for troubleshooting.

Two-speed induced draft motor. Direct spark ignition with remote sense. Top electrical connections. Optional indoor or outdoor combustion air.A variety of cooling coils and plenums designed to use with the Ruud Prestige Series T 90 Plus gas furnaces are available as optional accessories.