What is the minimum size of window blinds that iblinds will work with?

The smallest corded lift window blinds we have been able to fit the iblinds tilt motor into is an 18″ blind. You will need about 6″ free space in the headrail between the tilt drums to allow enough room. The iblinds device is 4.75″ long and it requires about another inch or so to allow for the plug-in connectors.nn