Gas Furnace Evolution 97% AFUE 100000 BTU Modulating Multi-position 21-Inch-Wide Cabinet

The Gas Furnace Evolution 97% AFUE 100000 BTU Modulating Multi-position 21-Inch-Wide Cabinet (987MC66100C21) delivers heating system technicians a full-feature, top-tier furnace engineered for efficiency and flexibility. With a nominal 100 000 BTU input (approximate output ~98 000 BTU) and a certified up-flow/horizontal AFUE of 97.3 % in this size class, it uses a modulating gas valve paired with a constant-airflow variable-speed ECM blower motor for precise load matching and quiet operation. The 21-wide cabinet measures 35 in height and 29.5 in depth, supports up-flow, down-flow, or horizontal installment in 4-way multipoise configurations, and accommodates direct-vent/sealed-combustion or ventilated-combustion-air systems via its side-wall or vertical venting options. Electrical requirements are 115 V single-phase with a unit ampacity of 18.5 A and a recommended 20 A circuit, and the gas connection is ½ NPT convertible for natural gas or propane. Temperature-rise range is rated at 45-75 °F for the maximum heat position and certified external static pressure is 0.20 in. w.c. for the heating airflow rating, making this unit installation-ready in tight mechanical spaces while delivering premium efficiency, quiet operation, and full installer-friendly service access.