I am looking for a wall switch to replace the one lost during remodeling. This is for our whole house attic fan. It looked like a light switch but was metal and had a Hi/Low/Off setting. It is a seperate box from the dial. (the dial does not turn it on or off, we have to have the switch) We have described this to three local hardware stores and our family electrician and no one knows what we are talking about. From searching online, I see these are included when buying the entire whole house fan system, but can not find just the switch. What do I ask for at the hardware store? What will work? Where can I find a replacement switch? (I assume this fan is from the 70s when the house was built)