- Four−position furnace: upflow, horizontal right, horizontal left, downflow
- Cabinet air leakage less than 2.0% at 1.0 in. W.C. and cabinet air leakage less than 1.4% at 0.5 in. W.C. when tested in accordance with ASHRAE standard 193
- Electronic control center
- Adjustable heating air temperature rise, LED diagnostics and self test feature
- Hot Surface Ignition (HSI)
- WFMR furnaces are approved for use with natural gas or propane gas with conversion kit
- WFML − Low NOx units are designed for California installations and meet 40 ng/J NOx emissions. Can be installed in air quality management districts with a 40 ng/J NOx emissions requirement.