As a veteran-grade industrial heater fan blade

allowing integration of key switches and audible alert devices within commercial control systems

If your furnace begins blowing cold air while the blower is still running

and Coleman furnaces using the 073-22671-000 design

Siemens Industrial Controls 3RW4027-1BB14 Starter 320735-701 As a veteran-grade industrial heaterIn the field, reliability and precise control are non negotiable for three phase asynchronous motors. The Siemens 3RW4027 1BB14 SIRIUS Soft Starter is a solid state starter engineered for basic performance in demanding HVACR and industrial environments. This SIRIUS 3RW40 soft starter provides a compact, 45mm width (S0 frame) solution for soft starting and stopping, effectively eliminating current spikes and mechanical stress common in across the line