Hi guys. Just had a new furnace put in. When i had the old furnace i cut into the power to the fan motor and used that to turn on An external fan. Now with a new furnace i dont want to do the same. I thought maybe use a low pressure switch off the blower from a water heater. Not sure if the airflow around the furnace fan would create a low enough state to operate the switch. Any one have an idea
Thanks Rick
Thanks Rick