Performance 80 Oil-fired Furnace Lowboy Maximize Your Heating Options   Energy efficient — up to 83.5% AFUE. Models available with Variable-speed fan or Multi-speed blower. Low constant fan switch helps prevent drafts. Sealed combustion design reduces burner sound. Limited lifetime warranty on heat exchanger. Five-year limited parts warranty.   Benefits - Built by the most trusted name in the industry, Carrier furnaces heat safely within your home. Download Brochure Features - Carrier pioneered several safety innovations over a decade before they became an industry requirement, such as 100% combustion and heat exchanger pressure test, while the control board constantly monitors the safety devices during the heating operation. Some other important features include:       Variable Speed Performance 80 ensures consistent airflow and temperature maintenance through the variable speed motor. Stainless steel primary heat exchanger – direct fired without the ceramic pre-combustion changer used in most other oil furnaces eliminates the maintenance associated with the ceramic chamber and allows every furnace to be 100% fire-tested at the factory. A ceramic pre-chambered furnace cannot be tested this way at the factory. Aluminized steel secondary heat exchanger – is tightly welded for added durability. High-performance Riello burner – provides quiet operation and optimal fuel efficiency. Ignition controls – reliably start the heating and combustion process for top-quality, reliable performance. Flue silencer baffle – helps reduce combustion noise at the source. Fully insulated walls – help reduce heat loss while helping to transfer maximum heat to your living spaces. Barometric draft control – assists in the proper venting of the furnace.       Specifications