Has anyone created a switch plate to switch from outside vent to air filter? I have been venting from my chimney in my living room for years, but I accepted the air filter I originally ordered because in the summer when it is really hot outside smoke does back up in y house. I guess it is the heat rises thing.
Anyway I would like to be able to switch between the outside venting and the filter as needed so I am looking for something I can create or by that will make that easy. I have seen a post where someone has made a way to open or close the vent, has anyone designed one that switches between two?