These YPLC residential gas furnaces are the only modulating 80% AFUE residential gas furnaces designs available today. This unique, compact unit design employs induced combustion, reliable hot surface ignition and high heat transfer aluminized tubular heat exchangers. The units are factory shipped for installation in upflow, horizontal, or downflow applications. These furnaces are designed for residential installation in a basement, closet, alcove, attic, recreation room or garage and are also ideal for commercial applications. All units are factory assembled, wired and tested to assure safe dependable and economical installation and operation. These CSA certified and approved furnaces are Category I listed and may be common vented with another gas appliance as allowed by the National Fuel Gas Code, including masonry chimneys with approved field kit. The CPLC models meet all requirements for low NOx emission levels required by the state of California.