I am wondering what's the difference between the two intakes shown in this photo? I moved in to this house about 1.5 yrs .. house has 2 main intakes that requires filters. There are several "return-air" ducts throughout the house without any filters. I have no idea what's the purpose of these return-air vents, and how come they don't have any filter. Any thoughts? I don't really understand the air flow process.
Thank you
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