I recently read about a system for bath fans that could be programed with the amount of exhaust ventilation required, would calculate manual usage and automatically run the fans to make up the difference. It was for multiple fans and communicated with each unit through the 110v wiring (no data cable needed). I think it was Panasonic and I’ve searched this site, Panasonic’s and Google to no avail. It seemed like a great option to use in conjunction with a central-fan-integrated supply ventilation.
Can someone point me in the right direction to find this product.