My son just bought a home that is about 5 years old. Somewhere in the sewer vent system there must be a blower. Every now and then I can hear it cycle and can feel the air movement at a pipe extending from the rear of the home. Also, at every P trape there is a small stand pipe with what appears to be a filter at the end.
Can someone explain this system to me and suggest where this blower might be located?
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