At least ten years ago I had a subfloor ventilator installed in my house by a Port Macquarie business, and I can’t help wondering if you were that company? If so, you might be interested to know that it has never been switched off since the day it was installed and in spite of numerous electricity cuts is still functioning well. My husband and I, both being very elderly are pretty sure it will see us out!
By the way, we live in Forster.
Kind regards. E Cooper.