Note: Low & high speed fixed manually. Medium is automatic with heat sensor (use 19-FS2-120) *c/w 7-1/2' cord & on-off switch (on cord) 200 CFM Tangential Blower 120 V, 1600 RPM, 2 9/16" Blower Wheel Used by popular O.E.M.'s like Elmira Woodstoves to circulate warm air Note: Low & high speed fixed manually. Medium speed is automatic with heat sensor leads (use 19-FS2-120 opens 120oF, closes 90oF).