[RW99]

Looking to see if anyone can help me understand a fan switch in my home. I have a forced air furnace with AC and humidifier, with a thermostat that controls the furnace fan when needed, 10 year old house.


But I have this second switch next to the thermostat that is labelled 'Ventilation Fan'. When turned on, the furnace fan goes on, so I thought maybe it was just a manual switch for that? I can't tell if there is another fan running anywhere in the walls. I did check the attic when it was turned on, I don't believe I have any powered ventilation fans in the attic. When getting the furnace serviced, Arpris had no clue.


But then I found some info on the new home construction documents. Under the Heating section, there is a separate line "In-Line Ventilation Fan: Complete with relay to furnace and separate switch and main floor".


So my question is, I have a fan that is in the vents that is in addition to the furnace fan? And assuming so, what should I be using it for? To help even out the temp across all floors? During forest fire season?


Any clarification would be appreciated!