third-party sellers on auction sites offering prices below $90—these are almost certainly counterfeits or factory seconds without the “top” acoustic treatment.
Moisture and odor control without the roar. Homeowners who install a sone124 top exhaust fan report less mold growth and better sleep quality, as the fan can run overnight without disturbance. sone124 top
If you encountered this in a medical or scientific context, it might be a misspelling of Sone (a measurement) or related to a specific chemical or paper type (like "stone paper"). third-party sellers on auction sites offering prices below