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A comment on IKEA made a smart air quality sensor to track indoor pollution. Parent comment

Re:IKEA made a smart air quality sensor to track indoor poll... by sib on Thursday February 16, 2023 @12:29PM (#34821929)
For those, like me, who didn't know:

ERV == Energy Recovery Ventilator

See https://en.wikipedia.org/wiki/Energy_recovery_ventilation

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