[Wormius]

Originally Posted by 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!

You may want to post this in Keith’s thread too.