Thank you for your question on the model 57V solid state speed control and QT140LE exhaust fan/light/night light. You cannot use the 57V with the QT140LE. For speed control you must use the model 78V (ivory) or 78W (white) multi-speed control. Please contact the Technical Service Department at 800-637-1453 if you need further assistance.
Date published: 2016-11-17