97% residential gas furnace CSA certified Upflow Modulating operation to save energy and maintain optimalcomfort level. Variable speed blower motor technology provides ultimatehumidity control, quieter sound levels, and year round energy savings. EcoNet enabled HVAC Product PlusOne Diagnostics 7-Segment LED all units PlusOne Ignition System - DSI for reliability and longevity PlusOne Water Management System with patentedBlockedDrain Sensor Heat exchanger is removable for improved serviceability.Aluminized steel primary and stainless steel secondary constructionprovide maximum corrosion resistance and thermal fatigue reliability. Low profile "34 inch" cabinet ideal for space constrainedinstallations. Blower Shelf design - serviceable in all furnaceorientations Pre marked hoses - insures proper system drainage Vent with 2" or 3" PVC Replaceable collector box Hemmed edges on cabinet and doors Quarter turn door fasteners for tool less access Integrated control boards feature dip switches for easysystem set up Self priming condensate trap Solid bottom included For optimal performance an EcoNet Control Center isrecommended; must be paired with an EcoNet enabled heat pump or airconditioner, for a fully communicating HVAC system. Modulating Function: when used with an EcoNet ControlCenter modulating thermostat, modulation rate between 40% and 100% oftotal 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-stagethermostat, furnace functions as a three stage furnace operating at40%, 65% and 100% of total capacity.