Quote:
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!
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It’s used to exhaust air out of your house. This switch will usually operate both your furnace “intake” fan and a bathroom exhaust fan allowing you to exchange air in your home. Because homes are sealed very well there is a need for the furnace to bring fresh air in meanwhile exhausting hot air out.
This can be used as a poor man’s AC when the inside of your house is very hot but the ambient temperature is significantly cooler.
Most of the time that switch never gets used.