The HVAC system we have is meant to have a fresh air intake - the house was built in 2016 and I’m the 2nd owner. It has an electrically controlled damper close to the HVAC Unit in the basement and a flexible insulated duct that goes from an outside side of house vent to the damper fitting. We also have a special switch installed in the far side of house guest bathroom exhaust fan that’s activated from time to time by the HVAC. It runs 10-15 minutes every so often - this bath fan does exhaust to the outside.
The question - the exterior vent used by developments builder for the HVAC fresh air intake has a damper flap that’s normally closed (spring loaded). All the homes here have it and so does a new development (by the same builder) a few miles away. So, if the HVAC system is supposed to get fresh air pulled in - why would an exterior vent be used that’s normally held closed by a spring? Is their some weird science at work here?
The question - the exterior vent used by developments builder for the HVAC fresh air intake has a damper flap that’s normally closed (spring loaded). All the homes here have it and so does a new development (by the same builder) a few miles away. So, if the HVAC system is supposed to get fresh air pulled in - why would an exterior vent be used that’s normally held closed by a spring? Is their some weird science at work here?
source https://hvac-talk.com/vbb/showthread.php?2225967-HVAC-Fresh-Air-Intake-Dampered-Exhaust-Vent-Used&goto=newpost
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