Hoping someone might know about the DVS home ventilation systems. I have a DVS-5 fan unit which I took out of our house. It originally had a power box which a switch plugged into which I only can guess controlled the speed of the fan. I can plug the fan directly into a wall socket and it appears to run at full speed, i.e. 2600rpm. I would like to install this at a property that I own however DVS say they no longer stock the parts so I am trying to figure out how I can get another switch to control the fan. I know it is a long shot but has anyone got any ideas?